ERICH Calculators
Home › Location & Data › ZIP Code to County Finder
Location & Data

ZIP Code to County Finder

Find the county associated with the geographic center of a U.S. ZIP code.

Free online toolWorks in your browserNo sign-up required
Explore this category

Location & Data

ZIP, price-level, currency and geographic data tools.

Category hub →

How to use this zip code to county finder

Enter the requested values above and select Calculate. Change the inputs to compare scenarios.

Formula and method

Looks up a ZIP centroid, then sends those coordinates to the U.S. Census Geocoder geographic lookup.

Example

Enter 53711 to look up the county covering that ZIP centroid.

What this calculator is useful for

Find the county associated with the geographic center of a U.S. ZIP code.

Frequently asked questions

What does this calculator do?

Find the county associated with the geographic center of a U.S. ZIP code.

What data or formula does it use?

ZIP centroids come from Zippopotam.us/GeoNames; county geography comes from the U.S. Census Geocoder. ZIPs can cross county boundaries, so this returns the county at the centroid.

Is it free?

Yes. ERICH Calculators is free to use and no account is required.

Source & assumptions

Reference and limitation

ZIP centroids come from Zippopotam.us/GeoNames; county geography comes from the U.S. Census Geocoder. ZIPs can cross county boundaries, so this returns the county at the centroid.

Transparency

Method, assumptions & corrections

See how formulas, sources and limitations are handled across ERICH Calculators.

View methodologyReport a problem

Related Location & Data calculators

Continue with the rest of this calculator cluster.

Distance Between ZIP Codes CalculatorZIP Code Radius CalculatorSales Tax by ZIP CalculatorCost of Living Comparison CalculatorSalary Comparison by Location CalculatorPopulation Growth CalculatorCurrency ConverterHistorical Currency CalculatorElevation & Grade by Location Calculator