CITY · NY

What county is Rochester, NY in?

Rochester, NY is mostly in Monroe County. County FIPS code 36055, population 748,482 (2023 estimate).

County details

City: Rochester, New York
Primary county: Monroe County
FIPS code: 36055
County population: 748,482

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

Questions

What county is Rochester in?

Rochester, NY is mostly in Monroe County.

What is the county seat of Monroe 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.