County lookup

Type a county name, or its FIPS code, and see its outline, its population and every ZIP code in it. For a name shared by several states, pick from the list.

How to use it

  1. Type the county name, with the state if you know it, or the five-digit FIPS code.
  2. If several counties match, pick one from the list.
  3. Read the outline, the population, the area and the ZIP codes in the county.

5 practical uses

  1. Find the FIPS code of a county for a dataset or a form.
  2. See a county's outline and where it is in the state.
  3. List the ZIP codes in a county for a mailing or a service area.
  4. Check the population and the area of a county.
  5. Tell apart counties that share a name in different states.

The maths behind it

The county outline comes from the Census Bureau topology; its area is the geodesic area of the polygon on the ellipsoid, and its centre is the centroid of that polygon. The population is the sum of the 2020 ZIP code populations assigned to the county, weighted by the share of each ZIP code inside it.

Notes

The 3,200 counties and county equivalents (parishes, boroughs, census areas, independent cities) come from the Census Bureau at 1:10m. Populations are the sum of the 2020 ZIP code populations assigned to the county, so they are close but not official. FIPS codes are the two-digit state code followed by the three-digit county code. To find the county where you are, see what county am I in.

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Questions and answers

What is a county FIPS code?

A five-digit code: two digits for the state and three for the county. 06037 is Los Angeles County, California.

How many counties are there?

About 3,200 counties and equivalents: parishes in Louisiana, boroughs and census areas in Alaska, and independent cities in Virginia.

Why is the population approximate?

It is the sum of the ZIP code populations assigned to the county, which is close to the census count but not equal to it.

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