Board of Supervisors
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The Board of Supervisors is the body that supervises the operation of county government in all U.S. counties in Arizona, California, Iowa, Mississippi, Virginia, and Wisconsin as well as a handful of counties in New York. There are equivalent agencies in other states.
Similar to a city council, a board of supervisors has legislative, executive, and quasi-judicial powers. The important difference is that a county is an administrative division of a state, whereas a city is a municipal corporation; thus, counties implement and, as necessary, refine the local application of state law and public policy, while cities produce and implement their own local laws and public policy (subject to the overriding authority of state law).
Boards may pass and repeal laws, generally called ordinances. Depending on the state, and the subject matter of the law, these laws may apply to the entire county or to only unincorporated areas not within the jurisdiction of a city. The board is also responsible for approving the county budget. County governments may collect state taxes and, in some states, they may also levy taxes, such as property or sales tax.
In some states, including Michigan, and in some New York counties until recently, county governing boards were composed of township (Michigan) or town (New York) "supervisors". These are the chief elected officials of each civil township. Boards of Supervisors they were originally composed of the various town/township supervisors from across the county. This system gave every township one vote on the county board regardless of its population, resulting in less populous townships having influence in decision-making that was disproportionate to their populations.
Both Michigan and New York changed how they elected county boards by dividing counties into single member districts, drawn so that each district has more or less the same sized population or with each township's vote weighted by population, under order from the Warren Court (see Reynolds v. Sims). In Michigan, the new board model was implemented in 1968. The name "Board of Supervisors" was changed to "Board of Commissioners" in 1970, however, to avoid confusion with township government (where the term "Supervisor" was still used). In New York, the new boards were called "county legislatures" (and their members, "county legislators"), but not every county has adopted this system. Those that retained the old boards of supervisors after the 1960s assigned each member a proportional vote based on the population represented.
Boards oversee county departments. Generally, this is done under the aegis of a county administrator or county executive. The power of the administrator or executive to act independently depends on the county charter. The administrator or executive usually has the authority over the day to day operations of the county's departments. Many boards independently appoint department heads, while other boards delegate that authority to the administrator or executive. Some department heads, like the sheriff or district attorney, may be elected separately by the electorate; however, the board still controls these departments' budgets.
In the City and County of San Francisco, a consolidated city-county government, the Board of Supervisors does dual duty as a county board of control and a city council, and the mayor is simultaneously city head of state and county executive.
In some states, the board is the final arbiter of decisions made by commissions underneath a board. This often involves land use planning issues.
In some states the equivalent body to a Board of Supervisors is called the County Council or County Commission; for Louisiana parishes, the equivalent body is a police jury. In New Jersey, the equivalent is the Board of Chosen Freeholders, while in Kentucky the equivalent is called the Fiscal Court. In Nebraska, some counties are governed by a board of supervisors while others are governed by a county commission. In New York, counties are governed by a county legislature, a board of representatives, or a board of supervisors.
In Pennsylvania, "Board of Supervisors" is the name of the body governing townships of the second class that have not adopted a home rule charter. By default, a Pennsylvania township board of supervisors consists of three members, elected at large in odd-numbered years to staggered six-year terms. Voters of a township of the second class can vote to expand the board to five members. In contrast, townships of the first class elect a Board of Commissioners, one member from each ward, ranging from 7 to 15 in number.