US Counties and FIPS
Rank US counties by July 2025 population estimate, nationally or within one state; largest or smallest first.
- Category
- Search & web
- Starting price
- $0.02
- Paid calls · 30 days
- 8
- Unique payers · 30 days
- 8
Paid endpoints
8 endpoints, sorted by usage. Prices are per request.
- GET/counties-by-population
Rank US counties by July 2025 population estimate, nationally or within one state; largest or smallest first.
$0.02Base1calls / 30d - GET/counties-in-state
List a state's counties or county equivalents with FIPS, population and land area; resolves FIPS, postal code or name.
$0.02Base1calls / 30d - GET/county-density
Population density of a US county per square mile and km of land, with national and state rank and US average.
$0.02Base1calls / 30d - GET/county-lookup
US county by 5-digit FIPS or name plus state: name, area, population, density, centroid. Census Bureau data.
$0.02Base1calls / 30d - GET/county-nearest-to-point
Counties whose Census centroids are nearest a latitude and longitude, with great-circle distance. Not point-in-polygon.
$0.02Base1calls / 30d - GET/county-search
Search US counties by full or partial name, optionally within one state; ranked, capped at 50.
$0.02Base1calls / 30d - GET/fips-parse-and-validate
Split a county FIPS into state and county parts, check both exist, flag retired, legacy or zero-dropped codes.
$0.02Base1calls / 30d - GET/state-summary
State totals from county data: county count, land and water area, population, density, largest and smallest counties.
$0.02Base1calls / 30d