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ARIZONA STATE SENATE
Fifty-Seventh Legislature, Second Regular Session
board of supervisors; membership
Purpose
Effective January 1, 2033, increases the size of a county board of supervisors (county BOS) in counties with a population between 1,000,000 and 3,000,000 persons to seven members and a population of more than 3,000,000 persons to nine members.
Background
Each county BOS consists of three members or five members, depending on the population of the county. Each county with a population of more than 175,000 persons must have five county BOS members and each county with a population of fewer than 175,000 persons must have three county BOS members, unless expanded pursuant to statutory requirements. By December 1, after the U.S. Decennial Census data is released, the county BOS must meet and divide the county into three or five supervisorial districts. A county supervisor must be a qualified elector of their supervisorial district and elected at a general election at which the President of the United States is elected. The four-year term of office for county supervisors begins on January 1 after the election. No person holding any other county or precinct office is eligible to run for the office of county supervisor. For the purposes of determining county BOS membership, population means the population according to the annual population estimate provided by the Office of Economic Opportunity (A.R.S. §§ 11-211 and 11-212).
There is no anticipated fiscal impact to the state General Fund associated with this legislation.
Provisions
1. Increases the number of members of a county BOS from:
a) five members to seven members, in a county with a population of between 1,000,000 and 3,000,000 persons; and
b) five members to nine members, in a county with a population of more than 3,000,000 persons.
2. Requires a county with seven supervisors to be divided into seven supervisorial districts and a county with nine supervisors to be divided into nine supervisorial districts.
3. Becomes effective on January 1, 2033.
Prepared by Senate Research
February 16, 2026
AN/ci