Census.gov
FreeUntestedOur check runs without a key, so we couldn't test this one. It doesn't mean it's down.
US Census Bureau demographic, economic and geographic data (ACS, decennial census, and more) by area.
Example request
curl -s 'https://api.census.gov/data/2024/acs/acs1?get=NAME,group(B01001)&for=us:1&key=$API_KEY'
Free tier, in plain English
Free API key from the Census Bureau with no stated per-day cap or paid tier found on the documentation pages checked.
Alternatives in Demographics
Agify.ioPredicts a likely age for a first name from statistics on roughly a billion people.FreemiumGenderize.ioPredicts likely gender for a first name using a database of over 1 billion people.FreemiumNameGenderPredicts gender and confidence from a first name, full name, email address, or username.FreemiumNationalize.ioEstimates a person's likely nationality (ranked country probabilities) from their first name.FreemiumPan Africa DataAfrican macroeconomic, demographic and income-distribution indicators, 2000–2035, by country and region.Freemium