About County Lookup
County Lookup answers “what county am I in?” using public U.S. government data, and publishes the Census list of every county with its FIPS code and population.
How lookups work
| Address | Census Bureau Geocoder. The most precise option. |
| ZIP code | The county at the ZIP code’s center point (FCC Area API). Some ZIP codes cross county lines. |
| Location | FCC Area API at your coordinates. Not stored. |
| Cities | The county containing the city’s center point. Large cities can span several counties. |
What this site is not
It is not affiliated with the Census Bureau, the FCC or any government agency, and it does not provide legal or tax advice. For official determinations, such as voting or tax jurisdiction, check with your county or state.
Last reviewed 2026-10-27.