[frisco] fills the entire county of [san francisco], so it can't help but be the county seat
the [capital city] of a [county], from which the county's [government] operates, and where [fairground]s and regional [office]s of state agencies are frequently located
"[frisco] fills the entire county of [san francisco], so it can't help but be the county seat" What is the definition of "county seat"?