CITY · FL

What county is St. Petersburg, FL in?

St. Petersburg, FL is mostly in Pinellas County. County FIPS code 12103, population 961,596 (2023 estimate).

County details

City: St. Petersburg, Florida
Primary county: Pinellas County
FIPS code: 12103
County population: 961,596

Some cities extend into more than one county. St. Petersburg is placed in the county that contains its center. For a specific address, use the address lookup.

Questions

What county is St. Petersburg in?

St. Petersburg, FL is mostly in Pinellas County.

What is the county seat of Pinellas County?

County seats are not part of the data on this site. Check the county’s official website.

Can a city be in two counties?

Yes. Large cities such as Houston and Atlanta cross county lines. The address lookup shows the exact county for any street address.

Sources: U.S. Census Bureau geographic reference files; FCC Area API; Census Bureau Population Estimates, Vintage 2023. Last reviewed 2026-10-27.