Instantly identify your U.S. county by ZIP code — or let us detect it automatically. Your detected location Tung Chung, Hong Kong Counties are a US administrative division. Use the search below to look up any US county by ZIP code. The United States has over 3,100 counties. Enter a ZIP code to find yours. Enter a ZIP Code When you visit FindMyCounty.com, we automatically detect your approximate county using your IP address — no GPS permission or browser popups required. For guaranteed accuracy, enter your 5-digit ZIP code in the search box. Every address in the United States falls within one of over 3,100 counties or county equivalents (parishes in Louisiana, boroughs in Alaska). Your county determines local taxes, voting districts, court jurisdictions, and government services. Browse by State Why Your County Matters Voting & Elections — Your county determines your polling location, ballot, and local candidates. Property Taxes — Tax rates and assessments are set at the county level.

Court & Legal — Court jurisdiction, jury duty, and legal filings are county-based. Government Services — Permits, licenses, and records are managed by county offices. Real Estate — County records, deed transfers, and zoning are all county-level. Emergency Services — Your county determines emergency response districts. Frequently Asked Questions Visit FindMyCounty.com and we'll automatically detect your county based on your IP address. For more precise results, enter your ZIP code in the search box. Yes, some ZIP codes span county boundaries. In those cases, we show the primary county associated with that ZIP code. Our IP-based detection is approximately 80-90% accurate at the city level. For guaranteed accuracy, enter your exact ZIP code. There are 3,143 counties and county-equivalents in the United States, including parishes (Louisiana), boroughs (Alaska), and independent cities. A county is a larger administrative division that typically contains multiple cities and towns. Cities are municipalities within counties that provide local services like police and fire departments. Your county determines your voting district, property tax rates, court jurisdiction, and access to county government services like permits and licenses.