US Census Data API
US Census Bureau
Up· checked 14 Nov 2026, 01:55 UTCFree keyGeography & demographics
ACS, decennial and economic census down to block group; keyless for light use.
Details
- Access
- Free keyNeeds a free API key from the publisher.
- Coverage
- us
- Updates
- annual
- Formats
- JSON
- License
- Public domain (US gov)
- Rate limit
- 500/day keyless
- API base
https://api.census.gov/data- Tags
- census, acs, population, demographics
- Added
- 14 Nov 2026
Status checks
Up Last check 14 Nov 2026, 01:55 UTC, HTTP 200, 353 ms.
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