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Learn: counties, ZIP codes and county lines

Plain-English guides to counties, ZIP codes and county lines, built from Census data and cited to the source.

Updated November 1, 2026 · Data: U.S. Census Bureau

What is a county? Counties, parishes, boroughs and planning regions explained

The US has 3,144 counties and county equivalents: parishes, boroughs, census areas, independent cities and Connecticut's planning regions. What they are and what they do.

Texas cities in more than one county

93 Texas cities and towns sit in two or more counties. In 8 of them, most of the land and most of the people are in different counties.

ZIP code vs ZCTA

A ZIP code is a set of mail routes, not an area. 9,721 of the 33,050 residential ZIP areas cross a county line. How ZCTAs work and how to find your county.

County lines and your address

Near a county line, phone GPS and simplified maps can put you in the wrong county. How accurate lookups are, why they disagree, and how to be sure.

How to confirm your county in Texas

The official ways to confirm which Texas county your address is in: appraisal district record, voter registration, tax statement and county offices.

Texas county FIPS codes

All 254 Texas county FIPS codes with county seats, how the 5-digit code is built, and a free CSV download.

County FIPS codes

A county FIPS code is a 5-digit ID: 2 digits for the state, 3 for the county. State codes, how counties are numbered, recent code changes and a free CSV of all 3,144.

What is a county seat? Meaning, examples and the counties with two

A county seat is the town where a county's government and courthouse are. 3,027 US counties have one, 28 have two, and some have none. Examples and how to find yours.

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CountyFinder

The private county lookup. Find what county you are in from your location, a city or a ZIP code, checked on your device against official U.S. Census Bureau county lines.

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© 2026 CountyFinder Privacy Terms Disclaimer Accessibility Data: U.S. Census Bureau 2024

CountyFinder is an independent website. It is not affiliated with the U.S. Census Bureau, USPS or any county, state or federal agency. County boundaries are from Census TIGER/Line, published for statistical purposes only: they are not a determination of jurisdictional authority or legal land descriptions. For legal or tax purposes, confirm your county with the county.