CITY · AZ

What county is Tucson, AZ in?

Tucson, AZ is mostly in Pima County. County FIPS code 04019, population 1,063,162 (2023 estimate).

County details

City: Tucson, Arizona
Primary county: Pima County
FIPS code: 04019
County population: 1,063,162

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

Questions

What county is Tucson in?

Tucson, AZ is mostly in Pima County.

What is the county seat of Pima 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.