What county is my ZIP code in?
Find your county by ZIP code. Type any 5-digit ZIP code to see its county, or every county it crosses with the share of land in each.
Updated · Data: U.S. Census Bureau
Find your county from your device's location. Works on phones and computers.
Your location stays on your device. County lines are downloaded and checked in your browser.
Type any 5-digit ZIP code, including PO box ZIPs, to see its county or every county it touches.
Type a city or town and its state. Works for 15,677 places with 1,000 or more people.
Enter latitude and longitude in decimal degrees, as shown by your phone or a map app.
Tip: paste "29.7604, -95.3698" into the first box and it fills both.
- Private: runs on your device
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- Official Census data
- All 50 states + DC
- No signup
How the ZIP code lookup works
- You type a 5-digit ZIP code.
- Your browser downloads a small file of ZIP code areas (Census 2020 ZCTA-county relationship file).
- It shows the county, or every county the ZIP code touches with its share of land.
Nothing you type is sent to us: the file is the same for everyone and the match happens on your device.
Why a ZIP code can be in more than one county
ZIP codes are mail routes, drawn without regard to county lines. Of the 33,050 ZIP code areas with residents, 9,721 (29%) cross at least one county line. For those, use your location or your street address to get the exact county. More in ZIP code vs ZCTA.
Examples
- 77001 (Houston): Harris County
- 77494 (Katy): Fort Bend County (85.0% of land), Waller County (8.0% of land), Harris County (7.0% of land)
- 10001 (New York): New York County, NY
- 90210 (Beverly Hills): Los Angeles County, CA
- 60614 (Chicago): Cook County, IL
- 30309 (Atlanta): Fulton County, GA
- 75201 (Dallas): Dallas County
- 85004 (Phoenix): Maricopa County, AZ
- 98101 (Seattle): King County, WA
- 33139 (Miami Beach): Miami-Dade County, FL
- 19103 (Philadelphia): Philadelphia County, PA
- 78704 (Austin): Travis County
- 37203 (Nashville): Davidson County, TN
When you need the county, not just the ZIP
- Voting: your county runs elections and voter registration.
- Property tax: county appraisal and tax offices bill by address.
- Courts and jury duty: cases are filed in a county.
- Forms and benefits: many state forms ask for your county of residence.
Sources: Census 2020 ZCTA-county relationship file; GeoNames postal codes (CC BY 4.0) for USPS place names and point-only ZIPs. Data as of November 1, 2026. Not affiliated with any government agency.
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