Fairfax County Republicans will nominate candidates for seven of the county’s 10 supervisor seats through a series of “firehouse canvass” elections, rather than a state-funded primary, a party official said Tuesday.

The Republican nominees for the other three seats, including chairman of the board of supervisors, will be chosen in the June 9 primary.

Firehouse canvass elections are funded by the party and generally have lower turnouts than primary elections, because voters must travel to just one designated spot to cast ballots.

Matt Ames, chairman of the Fairfax County Republican Committee, said several canvasses are likely to be held in separate county magisterial districts on the same day, most likely in late April or early May.

The two Republican supervisors who are running for another term, John Cook (Braddock) and Pat Herrity (Springfield), chose to compete in the primary, rather than a canvass, if any Republicans file to run against them.

So far, there are no Republican challengers for those seats.

The primary ballot will also include all Republican candidates running for chairman of the board of supervisors, a post currently held by Democrat Sharon Bulova; commonwealth’s attorney; and county sheriff, Ames said.

The nominees selected at the canvasses will be for the six supervisor seats currently held by Democrats, and for the seat being vacated by Republican Michael Frey (Sully).

“We’re still working on a calendar,” Ames said. “We’re trying to get them done on the early side.”