Va. Code § 24.2-307
The governing body of each county and city shall establish by ordinance as many precincts as it deems necessary. Each governing body is authorized to increase or decrease the number of precincts and alter precinct boundaries subject to the requirements of this chapter.
At the time any precinct is established, it shall have no more than 5,000 registered voters. The general registrar shall notify the governing body whenever the number of voters who voted in a precinct in an election for President of the United States exceeds 4,000. Within six months of receiving the notice, the governing body shall proceed to revise the precinct boundaries, and any newly established or redrawn precinct shall have no more than 5,000 registered voters.
At the time any precinct is established, each precinct in a county shall have no fewer than 100 registered voters and each precinct in a city shall have no fewer than 500 registered voters.
Each precinct shall be wholly contained within a single congressional district, Senate district, House of Delegates district, and election district used for the election of one or more members of the governing body or school board for the county or city. In each year ending in one, the governing body of each county and city shall establish the precinct boundaries to be consistent with any congressional district, Senate district, House of Delegates district, and local election district that was adopted by the appropriate authority by June 15 of that year. If congressional districts, Senate districts, House of Delegates districts, or local election districts have not been adopted by the appropriate authority by June 15 of a year ending in one, the governing body may use the congressional districts, Senate districts, House of Delegates districts, or local election districts as such districts existed on June 15 of that year as the basis for establishing the precinct boundaries to be used for the elections to be held in November of that year. Such governing body shall establish precinct boundaries to be consistent with any subsequent changes to the congressional districts, Senate districts, House of Delegates districts, or local election districts. If a governing body is unable to establish a precinct with the minimum number of registered voters without splitting the precinct between two or more congressional districts, Senate districts, House of Delegates districts, or local election districts, it shall apply to the State Board for a waiver to administer a split precinct. The State Board may grant the waiver or direct the governing body to establish a precinct with fewer than the minimum number of registered voters as permitted by § 24.2-309. A governing body granted a waiver to administer a split precinct or directed to establish a precinct with fewer than the minimum number of registered voters may use such a precinct for any election held that year.
The governing body shall establish by ordinance one polling place for each precinct.
Va. Code § 24.2-307