CO Code § 1-4-205 (2021)
2021 Colorado Code|Title 1 - Elections|Article 4 - Elections - Access to Ballot by Candidates|Part 2 - General Elections|§ 1-4-205. County Commissioners

     Members of the board of county commissioners shall be elected in each county, excluding a city and county, for a term of four years.    No person shall be a county commissioner unless that person is a registered elector and has resided in the district for at least one year prior to the election.       Each county having a population of less than seventy thousand shall have three county commissioners, any two of whom shall constitute a quorum for the transaction of business. One commissioner shall be elected at the general election in 1982 and every four years thereafter, and two commissioners shall be elected at the general election in 1984 and every four years thereafter.      In each county having a population of seventy thousand or more, the board of county commissioners may consist either of three members, any two of whom shall constitute a quorum for the transaction of business, or of five members, any three of whom shall constitute a quorum for the transaction of business.    If the board consists of three commissioners, they shall be elected as provided in subsection (2) of this section and as provided in section 30-10-306.7 (5), C.R.S.    In any county having a population of seventy thousand or more, the membership of the board of county commissioners may be increased from three to five members pursuant to section 30-10-306.5, C.R.S., or decreased from five to three members pursuant to section 30-10-306.7 (2)(a)(II), C.R.S.         History. Source: L. 80: Entire article R&RE, p. 323, § 1, effective January 1, 1981. L. 88: (3)(b) and (3)(c) amended, p. 1113, § 3, effective April 9; (1) amended, p. 297, § 1, effective January 1, 1989. L. 92: Entire part amended, p. 674, § 4, effective January 1, 1993.    Editor's note:   This section is similar to former § 1-16-106 as it existed prior to 1980.   Cross references:   For election and terms of county officers, see §§ 6 and 8 of art. XIV, Colo. Const.; for statutes relating to county officers generally, see article 10 of title 30.   ANNOTATION   Law reviews. For article, “Colorado's Program to Improve Court Administration”, see 38 Dicta 1 (1961).   Annotator's note. The following annotations include a case decided under former provisions similar to this section.   Courts would not inquire into county's increase in commissioners. Where a county entitled to increase the number of its commissioners from three to five, did make such increase, and the people of the county acquiesced therein and thereafter elected successors to the added members of the board so as to keep the number at five, in an action brought by private individuals twenty years after such increase was made to test the right of the successors of the added members of the board to the office, the courts will not inquire into the regularity of the proceeding making such increase. People ex rel. Lankford v. Long, 32 Colo. 486 , 77 P. 251 (1904).   And court action was not maintainable. In an action against two county commissioners jointly to test their right to hold their offices on the ground that the board was illegally increased from three to five members and that respondents were the successors in office of the two illegally added members of the board, where it appears that one of the respondents was not a successor of either of the added members of the board, a joint action could not be maintained against respondents. People ex rel. Lankford v. Long, 32 Colo. 486 , 77 P. 251 (1904).