CITY · WI

What county is Green Bay, WI in?

Green Bay, WI is mostly in Brown County. County FIPS code 55009, population 271,417 (2023 estimate).

County details

City: Green Bay, Wisconsin
Primary county: Brown County
FIPS code: 55009
County population: 271,417

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

Questions

What county is Green Bay in?

Green Bay, WI is mostly in Brown County.

What is the county seat of Brown 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.