Chapter 59

59.03(2)(f) (f) The powers conferred by this subsection shall be in addition to all other grants of power and shall be limited only by express language.

59.03 History History: 1995 a. 201 ss. 97, 99, 243; 2005 a. 40; 2013 a. 14.

59.03 Annotation Sub. (2) provides a unique procedure that may be used in specific fact situations to levy a property tax for a county service, but it is not the only authorization for a county to levy such a tax. Town of Grant v. Portage County, 2017 WI App 69, 378 Wis. 2d 289, 903 N.W.2d 152, 16-2435.

59.03 Annotation County home rule under sub. (1) allows every county to “exercise any organizational or administrative power, subject only to the constitution and to any enactment of the legislature.” The language of s. 60.565 authorizing towns to provide ambulance service acknowledges that another person can provide the ambulance service instead of a town and withdraws the mandate when another person provides ambulance services. The absence of a command from the legislature that towns provide an ambulance service in all situations causes the argument that county home rule prevents counties from providing ambulance service to miss the mark. Town of Grant v. Portage County, 2017 WI App 69, 378 Wis. 2d 289, 903 N.W.2d 152, 16-2435.

59.03 Annotation In a county that does not have a county executive or administrator, the personnel committee of the county board does not possess the statutory authority to remove the county social services director. The county board may not, under s. 59.025 [now sub. (1)], transfer the authority to appoint. 81 Atty. Gen. 145.

59.04 59.04 Construction of powers. To give counties the largest measure of self-government under the administrative home rule authority granted to counties in s. 59.03 (1), this chapter shall be liberally construed in favor of the rights, powers and privileges of counties to exercise any organizational or administrative power.

59.04 History History: 1985 a. 29; 1995 a. 201 s. 98; Stats. 1995 s. 59.04.

59.05 59.05 County seat; change.

59.05(1) (1) The county seat shall be fixed and designated by the board at the first regular meeting after the organization of any county; and no county seat shall be changed except as provided in this section.

59.05(2) (2) If a petition conforming to the requirements of s. 8.40 is filed with the board by at least two-fifths of the legal voters of any county, to be determined by the registration list for the last previous general election held in the county at the time of filing, the names of which voters shall appear on the registration list for such election, asking for a change of the county seat to some other place designated in the petition, the board shall submit the question of removal of the county seat to a vote of the qualified voters of the county. The board shall file the question as provided in s. 8.37. The election shall be held only on the day of the general election, notice of the election shall be given and the election shall be conducted as in the case of the election of officers on that day, and the votes shall be canvassed, certified and returned in the same manner as other votes at that election. The question to be submitted shall be “Shall the county seat of .... county be removed to ....?”.

59.05(3) (3) If a majority of the votes cast at the election are in favor of the proposed change, the chairperson of the board shall certify the same, with the attestation of the county clerk, to the governor, who shall issue a proclamation to that effect and publish it in the official state paper. From the date of publication the place designated shall be the county seat. The board may not again submit the question of removal within 5 years.

59.05(4) (4) Notwithstanding subs. (2) and (3), no election to change a county seat may be held for a period of 5 years after the year in which a courthouse or other county building costing $3,000 or more was built at the county seat and occupied for county purposes.

59.05 History History: 1977 c. 427; 1983 a. 192, 484; 1989 a. 192; 1995 a. 201 s. 247; Stats. 1995 s. 59.05; 1997 a. 35; 1999 a. 182; 2003 a. 265.

59.05 Annotation When 40 percent of registered voters were denied ballots in an election to remove a county seat, the election was set aside even though the outcome probably was not affected. McNally v. Tollander, 100 Wis. 2d 490, 302 N.W.2d 440 (1981).

59.06 59.06 County property.

59.06(1) (1) How held. County property shall be held by the clerk in the name of the county. All property, real or personal, conveyed to the county or to its inhabitants or to any person for the use of the county or its inhabitants is county property. Such conveyances have the same effect as if made directly to the county by name.

59.06(2) (2) Effect of transfer. All deeds, contracts and agreements made on behalf of the county under the directions of the board under s. 59.52 (6), or by a county executive acting under s. 59.17 (2) (b) 3., when signed and acknowledged by the clerk and the county seal is attached, are valid and binding on the county to the extent of the terms of the instrument and the right, title and interest which the county has in the property.

59.06 History History: 1995 a. 201 s. 402; Stats. 1995 s. 59.06; 2013 a. 14.

59.06 Cross-reference Cross-reference: See ss. 75.35 and 75.69 for restrictions on the sale of tax deeded land.

59.07 59.07 Claims against counties; actions on.

59.07(1) (1) No action may be brought or maintained against a county upon a claim or upon a cause of action unless the claimant complies with s. 893.80. This subsection does not apply to actions commenced under s. 19.37, 19.97 or 281.99.

59.07(2) (2) No action may be brought or maintained against a county, for disclosure of information that is received under s. 30.572 (4) and maintained under s. 30.572 (5).

59.07 History History: 1977 c. 285; 1979 c. 323 s. 33; 1981 c. 20; 1991 a. 39; 1995 a. 158; 1995 a. 201 s. 426; Stats. 1995 s. 59.07; 1997 a. 27, 35; 2013 a. 163.

59.08 59.08 Consolidation of counties; procedure; referendum.

59.08(1) (1) Any 2 or more adjoining counties may consolidate into a single county by complying with the requirements and procedure herein specified.

59.08(2) (2) The boards of any 2 or more adjoining counties desiring to consolidate their respective counties into a single county may enter into a joint agreement for the consolidation of the counties, setting forth in the consolidation agreement all of the following:

59.08(2)(a) (a) The names of the several counties which they propose to be consolidated.

59.08(2)(b) (b) The name under which it is proposed to consolidate the counties, which name shall be such as to distinguish it from the name of any other county in Wisconsin, other than the consolidating counties.

59.08(2)(c) (c) The property, real and personal, belonging to each county, and the current fair market value thereof.

59.08(2)(d) (d) The indebtedness, bonded and otherwise, of each county.

59.08(2)(e) (e) The proposed name and location of the county seat of the consolidated county.

59.08(2)(f) (f) If the counties have different forms of county organization and government, the proposed form of county organization and government of the consolidated county.

59.08(2)(g) (g) The terms of agreement.

59.08(3) (3) The board of each county may appoint an advisory committee composed of 3 persons to assist the board in the preparation of the agreement.

59.08(4) (4) The original of the consolidation agreement, together with a petition on behalf of the several boards, signed by the chairperson of each of the boards, asking that a referendum on the question of consolidation of the several counties be ordered, shall be filed with the clerk of the circuit court of one of the counties and a copy of the consolidation agreement and of the petition shall be filed with the clerk of the circuit court of each of the other counties.

59.08(5) (5) The qualified electors of each county involved in the consolidation proposal whose board has not taken the initiative under sub. (2) may, by filing with the board a petition conforming to the requirements of s. 8.40, signed by not less than 20 percent of the qualified electors of the county, based on the total vote cast for governor at the last general election, asking the board to effect a consolidation agreement with the county or counties named in the petition, and asking for a referendum on the question, require the board to so proceed. A copy of the petition of the electors shall also be filed with the clerk of the circuit court of the county. If the board is able within 6 months thereafter to effect the consolidation agreement, the procedure shall be the same as set forth in this section. If the board within that period of time is unable or for any reason fails to perfect the consolidation agreement, then the judge of the circuit court of the county shall appoint a committee of 5 representative citizens of the county, to act for and in lieu of the board in perfecting the consolidation agreement and in petitioning for a referendum.

59.08(6) (6) The board shall publish the consolidation agreement as a class 1 notice under ch. 985. The owner-editor or manager of each newspaper publishing the notice shall issue a certificate of the publication to the judge of the circuit court for each affected county, which shall be proof of publication.

59.08(7) (7) 

59.08(7)(a) (a) When publication of the consolidation agreement in each of the counties included in the agreement is completed, the judges of the circuit courts of those counties shall, by order entered of record in each of the counties, require the clerks of each of the counties to submit the question of the consolidation of the counties to a vote of the qualified electors of the counties.

59.08(7)(b) (b) The question of the consolidation of the counties shall be submitted to the voters at the next election to be held on the first Tuesday in April, or the next regular election, or at a special election to be held on the day fixed in the order issued under par. (a), which day shall be the same in each of the counties proposing to consolidate. A copy of the order shall be filed with the county clerk of each of the counties as provided in s. 8.37. If the question of consolidation is submitted at a special election, it shall be held not less than 70 days nor more than 88 days from the completion of the consolidation agreement, but not within 60 days of any spring or general election.

59.08(8) (8) The clerk shall notice such election as other elections. The ballots shall be provided by the clerk and shall be in substantially the following form:

OFFICIAL REFERENDUM BALLOT

If you desire to vote for the consolidation of .... (insert names of counties proposing to consolidate) counties under a consolidation agreement, make a cross (X) in the square after the word “Yes”, underneath the question; if you desire to vote against consolidation, make a cross (X) in the square after the word “No”, underneath the question.

Shall .... (here insert names of counties proposing to consolidate) counties consolidate under a consolidation agreement?

YES ⬜ NO ⬜

59.08(9) (9) The ballot shall have on the back or reverse side the endorsements provided by law for ballots for general elections and shall be marked by the elector and counted and canvassed as other ballots cast on questions in the county are counted and canvassed. The election shall be conducted by the same officers and in the same manner as are other elections in the county. The results of the election shall be certified to the judges of the circuit courts for the counties.

59.08(10) (10) If a majority of the votes cast in each county upon the question of consolidation are in favor of the consolidation of the counties, the judge of the circuit court shall enter that fact of record in each county. If in any one of the counties less than a majority of the votes cast upon the question of consolidation are in favor of the proposed consolidation, the consolidation shall be declared to have failed for all purposes. If a majority of the votes cast upon the question of consolidation in any county are opposed to consolidation, the question of consolidation shall not be again submitted to the electors of that county for a period of 2 years.

59.08(11) (11) At the next succeeding regular November election, held at least 60 days after the election at which consolidation is approved by the voters, there shall be elected for the consolidated county all county officers provided for by law and the officers shall be nominated as provided in ch. 6. Their terms shall begin on the first Monday of January next succeeding their election, at which time they shall replace all elective county officers of the counties that are consolidated into the consolidated county whose terms shall on that day terminate. All appointive county officers shall be appointed by the person, board or authority upon whom the power to appoint such officers in other counties is conferred. The terms of the officers shall commence on the first Monday of January next succeeding the first election of officers for the consolidated county, and shall continue, unless otherwise removed, until their successors have been appointed and qualified. The successors of all officers whose first election or appointment is provided for in this subsection shall thereafter be elected or appointed at the time, in the manner and for the terms provided by law.

59.08(13) (13) Upon the first Monday of January following the first election of county officers for the consolidated county, the several counties shall thereafter for all purposes be treated and considered as one county, under the name and upon the terms and conditions set forth in the consolidation agreement. All rights, privileges, and franchises of each of the several counties, and all records, books, and documents, and all property, real and personal, and all debts due on whatever account, as well as other things in action, belonging to each of the counties, shall be considered transferred to and vested in the consolidated county, without further act or deed. All property, all rights-of-way, and all and every other interest shall be as effectually the property of the consolidated county as they were of the several counties before the consolidation. The title to real estate, either by deed or otherwise, under the laws of this state vested in any of the counties, shall not be considered to revert or be in any way impaired by reason of this consolidation. The rights of creditors and all liens upon the property of any of the counties shall be preserved unimpaired, and the respective counties shall be considered to continue in existence to preserve the same and all debts, liabilities and duties of any of the counties shall attach to the consolidated county and be enforced against it to the same extent as if the debts, liabilities and duties had been incurred or contracted by it, unless by the terms of the agreement the outstanding bonded indebtedness of the counties shall not be transferred and attached to the consolidated county, but shall remain as obligations of the counties which for such purpose shall be considered to continue in existence.

59.08(14) (14) Suits may be brought and maintained against the consolidated county in any of the courts of this state in the same manner as against any other county. Any action or proceeding pending by or against any of the counties consolidated may be prosecuted to judgment as if the consolidation had not taken place, or the consolidated county may be substituted in its place. The towns, school districts, election districts and voting places in the consolidated county shall continue as in the several counties before consolidation, unless and until changed in accordance with law.

59.08(15) (15) Until changed by law, the same circuit courts shall continue, though it may result in the consolidated county being a part of 2 or more circuits. All such courts shall, however, be held at the place designated as the county seat of the consolidated county, and each such court and the judge of that court shall continue to have and exercise the same jurisdiction as the court or the judge had and exercised before the consolidation. If 2 or more judges have jurisdiction in any consolidated county they or a majority of them shall exercise the power to appoint officers and fill vacancies as is vested in judges of circuit courts of other counties.

59.08(16) (16) For the purpose of representation in congress and in the legislature the existing congressional, senatorial and assembly districts shall continue until changed in accordance with law. The consolidated county shall in all respects, except as otherwise provided in this section, be subject to all the obligations and liabilities imposed, and shall possess all the rights, powers and privileges vested by law in other counties.

59.08(17) (17) The provisions of this section shall be considered cumulative and the authority granted in this section to counties shall not be limited or made inoperative by any existing statute.

59.08 History History: 1977 c. 449; 1979 c. 311; 1981 c. 377; 1983 a. 192; 1989 a. 56, 192; 1991 a. 316; 1993 a. 490; 1995 a. 16 ss. 1, 2; 1995 a. 201 ss. 480 to 483; Stats. 1995 s. 59.08; 1995 a. 225 ss. 175 to 179; 1997 a. 35; 1999 a. 182; 2001 a. 16; 2011 a. 75.

subch. III of ch. 59 SUBCHAPTER III

COUNTY BOARD OF SUPERVISORS

59.10 59.10 Boards: composition; election; terms; compensation; compatibility. The boards of the several counties shall be composed of representatives from within the county who are elected and compensated as provided in this section. Each board shall act under sub. (2), (3) or (5), unless the board enacts an ordinance, by a majority vote of the entire membership, to act under sub. (1). If a board enacts such ordinance, a certified copy shall be filed with the secretary of state.

59.10(1) (1) Self-organized counties.

59.10(1)(a) (a) Number of supervisors and apportionment of supervisory districts. In each county with a population of at least 750,000, sub. (2) (a) and (b) applies. In counties with a population of less than 750,000 and more than one town, sub. (3) (a) to (c) applies. In counties with one town only, sub. (5) applies.

59.10(1)(b) (b) Terms. The term of office of supervisors is 2 years. A board may determine whether the terms shall be concurrent or staggered. Supervisors shall be elected at the election to be held on the first Tuesday in April next preceding the expiration of their respective terms and shall take office on the 3rd Tuesday in April following their election. If the board determines that supervisors shall serve staggered terms, the board shall, by ordinance, provide for a division of supervisors into 2 classes, one class to be elected for one-half of a full term and the other class for a full term and thereafter the supervisors shall be elected for a full term. The board shall publish the ordinance as a class 1 notice, under ch. 985, or as a notice, as described under s. 59.14 (1m) (b), before publication of the notice of the election at which supervisors are to be elected.

59.10(1)(c) (c) Compensation. The method of compensation for supervisors shall be determined by the board.

59.10(1)(d) (d) Vacancies. A board may determine the procedure for filling a vacancy.

59.10(2) (2) Milwaukee County. In each county with a population of at least 750,000:

59.10(2)(a) (a) Composition; supervisory districts. Within 60 days after the population count by census block, established in the decennial federal census of population, and maps showing the location and numbering of census blocks become available in printed form from the federal government or are published for distribution by an agency of this state, but no later than July 1 following the year of each decennial census, the board shall adopt and transmit to the governing body of each city and village wholly or partially contained within the county a tentative county supervisory district plan to be considered by the cities and villages when dividing into wards. The tentative plan shall specify the number of supervisors to be elected and shall divide the county into a number of districts equal to the number of supervisors, with each district substantially equal in population and consisting of contiguous whole wards or municipalities, except as authorized in sub. (3) (b) 2. Except as otherwise provided in this paragraph, the board shall develop and adopt the tentative plan in accordance with sub. (3) (b) 1. The tentative plan shall not include provision for division of any census block, as utilized by the U.S. bureau of the census in the most recent federal decennial census, unless the block is bisected by a municipal boundary or unless a division is required to enable creation of supervisory districts that are substantially equal in population. The board shall adopt a final plan by enacting an ordinance in accordance with sub. (3) (b) 2. to 4. Changes to the final plan shall be governed by par. (d) and sub. (3) (c).

59.10(2)(b) (b) Election; term. For an election that is held before 2016, supervisors shall be elected for 4-year terms at the election to be held on the first Tuesday in April next preceding the expiration of their respective terms, and shall take office on the 3rd Monday in April following their election. For an election that is held in 2016 and thereafter, supervisors shall be elected for 2-year terms at the election to be held on the first Tuesday in April next preceding the expiration of their respective terms, and shall take office on the 3rd Monday in April following their election.

59.10(2)(c) (c) Compensation.

59.10(2)(c)1. 1. Each supervisor shall be paid by the county an annual salary set by the board. The board may provide additional compensation for the chairperson, such that his or her salary may be an amount of up to 150 percent of the salary of a supervisor, and for the chairperson of the board’s finance committee, such that his or her salary may be an amount of up to 125 percent of the salary of a supervisor. Beginning with the term that commences in April 2016, the total dollar value of the annual salary and benefits that may be paid to a supervisor, other than the board chairperson and finance committee chairperson, may not exceed the annual per capita income of Milwaukee County as most recently determined by the U.S. bureau of the census and may be increased for a new term as provided in subds. 2. and 3., subject to the limit specified in subd. 4. Section 66.0505 applies to this paragraph.

59.10(2)(c)2. 2. The board may increase the salary specified in subd. 1., or as otherwise adjusted under this paragraph, by an amount that does not exceed the percentage increase in the U.S. consumer price index for all urban consumers, U.S. city average, for the period between the time that a supervisor’s salary was last set under subd. 1. or by the board, and the year before the year in which the salary increase is to take effect.

59.10(2)(c)3. 3. The board may increase the salary specified in subd. 1., or as otherwise adjusted under this paragraph, by an amount that exceeds the percentage increase in the U.S. consumer price index for all urban consumers, U.S. city average, for the period between the time that a supervisor’s salary was last set under subd. 1. or by the board, and the year before the year in which the salary increase is to take effect, except that such an increase may not take effect unless it is ratified by a majority vote of the electors in the county voting in a referendum on the proposed salary increase.

59.10(2)(c)4. 4. A supervisor may not receive any other benefits or compensation, including health insurance and pension benefits, not specifically authorized or required by law. The maximum total dollar value of the salary and benefits that a supervisor, other than the chairperson of the board and the chairperson of the finance committee, receives in any year may not exceed the annual per capita income of Milwaukee County as most recently determined by the U.S. bureau of the census.

59.10(2)(d) (d) Changes during decade.

59.10(2)(d)1. 1. ‘Number of supervisors; redistricting.’ The board may, not more than once prior to November 15, 2010, decrease the number of supervisors after the enactment of a supervisory district plan under par. (a). In that case, the board shall redistrict, readjust, and change the boundaries of supervisory districts, so that the number of districts equals the number of supervisors, the districts are substantially equal in population according to the most recent countywide federal census, the districts are in as compact a form as possible, and the districts consist of contiguous municipalities or contiguous whole wards in existence at the time at which the amended redistricting plan is adopted, except as authorized in sub. (3) (b) 2. In the amended plan, the board shall adhere to the requirements under sub. (3) (b) 2. with regard to contiguity and shall, to the extent possible, place whole contiguous municipalities or contiguous parts of the same municipality within the same district. In the amended plan, the original numbers of the districts in their geographic outlines, to the extent possible, shall be retained. The chairperson of the board shall file a certified copy of any amended plan adopted under this subdivision with the secretary of state.

59.10(2)(d)2. 2. ‘Election; term.’ Any amended plan enacted under subd. 1. becomes effective on the first November 15 following its enactment, and first applies to the spring election following the plan’s effective date. Any amended plan enacted under subd. 1. shall remain in effect until the effective date of a redistricting plan subsequently enacted under par. (a). Supervisors elected from the districts created under subd. 1. shall serve for 4-year terms and shall take office on the 3rd Monday in April following their election.

59.10(3) (3) Other counties.

59.10(3)(a) (a) Classification; maximum number of supervisors. Counties with a population of less than 750,000 and more than one town are classified and entitled to a maximum number of supervisors as follows:

59.10(3)(a)1. 1. Counties with a population of less than 750,000 but at least 100,000 shall have no more than 47 supervisors.

59.10(3)(a)2. 2. Counties with a population of less than 100,000 but at least 50,000 shall have no more than 39 supervisors.

59.10(3)(a)3. 3. Counties with a population of less than 50,000 but at least 25,000 shall have no more than 31 supervisors.

59.10(3)(a)4. 4. Counties with a population of less than 25,000 and containing more than one town shall have no more than 21 supervisors.

59.10(3)(a)5. 5. If the population of any county is within 2 percent of the minimum population for the next most populous grouping under this paragraph, the board thereof, in establishing supervisory districts, may employ the maximum number for such districts set for such next most populous grouping.

59.10(3)(b) (b) Creation of supervisory districts.

59.10(3)(b)1. 1. Within 60 days after the population count by census block, established in the decennial federal census of population, and maps showing the location and numbering of census blocks become available in printed form from the federal government or are published for distribution by an agency of this state, but no later than July 1 following the year of each decennial census, each board shall propose a tentative county supervisory district plan setting forth the number of supervisory districts proposed by the board and tentative boundaries or a description of boundary requirements, hold a public hearing on the proposed plan and adopt a tentative plan. The proposed plan may be amended after the public hearing. The tentative plan shall divide the county into a number of districts equal to the number of supervisors, with each district substantially equal in population. The board shall solicit suggestions from municipalities concerning the development of an appropriate plan. Except as authorized in this subdivision, each district shall consist of whole wards or municipalities. Territory within each supervisory district to be created under the tentative plan shall be contiguous, except as authorized in subd. 2. In the tentative plan, the board shall, whenever possible, place whole contiguous municipalities or contiguous parts of the same municipality within the same district. If the division of a municipality is sought by the board, the board shall provide with the plan a written statement to the municipality affected by each proposed division specifying the approximate location of the territory from which a ward is sought to be created for contiguity purposes and the approximate population of the ward proposed to effectuate the division. The tentative plan shall not include provision for division of any census block unless the block is bisected by a municipal boundary or unless a division is required to enable creation of supervisory districts that are substantially equal in population. The board shall transmit a copy of the tentative plan that is adopted to each municipal governing body in the county.

59.10(3)(b)2. 2. Within 60 days after every municipality in the county adjusts its wards under s. 5.15, the board shall hold a public hearing and shall then adopt a final supervisory district plan, numbering each district. Territory within each supervisory district created by the plan shall be contiguous, except that one or more wards located within a city or village which is wholly surrounded by another city or water, or both, may be combined with one or more noncontiguous wards, or one or more wards consisting of island territory as defined in s. 5.15 (2) (f) 3. may be combined with one or more noncontiguous wards within the same municipality, to form a supervisory district.

59.10(3)(b)3. 3. The populations of supervisory districts under the tentative plan shall be determined on the basis of the federal decennial census and any official corrections to the census issued on or before the date that the tentative plan is adopted to reflect the correct population of the county and municipalities and blocks within the county on April 1 of the year of the census. The populations of supervisory districts under the final plan shall be determined on the basis of the federal decennial census and any official corrections to the census to reflect the correct populations of the county and the municipalities and blocks within the county on April 1 of the year of the census, if the corrections as they affect any municipality are issued prior to division of the municipality into wards under s. 5.15, or if a municipality is not divided into wards, prior to adoption of the final plan.

59.10(3)(b)4. 4. The chairperson of the board shall file a certified copy of the final districting plan with the secretary of state. Unless otherwise ordered under sub. (6), a plan enacted and filed under this paragraph, together with any authorized amendment that is enacted and filed under this section, remains in effect until the plan is superseded by a subsequent plan enacted under this subsection and a certified copy of that plan is filed with the secretary of state.

59.10(3)(c) (c) Changes during decade; municipal boundary adjustments.

59.10(3)(c)1. 1. After the enactment of a plan of supervisory districts under par. (b), the board may amend the plan to reflect a municipal incorporation, annexation, detachment or consolidation. The number of supervisory districts in the county shall not be changed by any action under this subdivision.

59.10(3)(c)2. 2. Within 60 days after enactment or adoption of a revised division ordinance or resolution under s. 5.15 (4) (a), the board shall amend the county supervisory district plan under par. (b) to reflect any renumbering of the wards specified in the plan.

59.10(3)(c)3. 3. The districts under the amended plan shall be substantially equal in population according to the most recent countywide federal census and shall be in as compact a form as possible. The board shall adhere to the requirements of par. (b) 2. with regard to contiguity and shall, to the extent possible, place whole contiguous municipalities or contiguous parts of the same municipality within the same district. In the amended plan, the original numbers of the districts in their geographic outlines, to the extent possible, shall be retained. An amended plan becomes effective on the first November 15 following its enactment.