Census data that works the way you write code.
PrairieCloud wraps the U.S. Census Bureau API in a clean REST interface — human-readable variable names, consistent JSON responses, and automatic margin-of-error pairing across all ACS vintages.
# Census Bureau API
# What variable is B01003_001E? Who knows.
curl "https://api.census.gov/data/2022/acs/acs5?get=NAME,B01003_001E&for=county:031&in=state:17&key=YOUR_CENSUS_API_KEY"
# Response (array of arrays, no field names):
[
["NAME","B01003_001E","state","county"],
["Cook County, Illinois","5173146","17","031"]
]# PrairieCloud API
# Variable names you can read at 2am.
curl -H "X-API-Key: YOUR_PC_API_KEY" \
"https://api.prairiecloud.io/v1/data\
?variables=sex_and_age_total_population\
&geo=county:17031&vintage=2022"
# Response (JSON, named fields, MOE included):
{
"data": {
"county:17031": {
"name": "Cook County, Illinois",
"variables": {
"sex_and_age_total_population": {
"estimate": 5173146,
"margin_of_error": null
}
}
}
}
}Jump in
Quickstart
Make your first API call in under 5 minutes. API key, endpoint, response — done.
Start here →Data Guide
Understand datasets, vintages, and geographic hierarchies before you build.
Explore data →Code Examples
Copy-paste snippets in Python, JavaScript, R, and cURL for common use cases.
See examples →API Reference
Full endpoint documentation with interactive request builder and response schemas.
Open reference →Why PrairieCloud
The Census Bureau API is a 2010-era XML service retrofitted for JSON. We didn't wrap it — we redesigned the interface.
Human-readable variable names
No more decoding ACS codebooks. Every variable ships with a plain-English name like sex_and_age_total_population. The cryptic B-codes are still there if you need them — but you won't.
Geographic resolution by FIPS code
Query by state, county, tract, or block group using standard FIPS codes. Nest geographies naturally: /state/17/county/031 gives you Cook County. No TIGER workarounds.
Multiple vintages with automatic MOE pairing
Request any available ACS vintage and receive margin-of-error fields automatically paired with their estimates. Time-series analysis without the manual join.
Ready to query?
Free tier. No credit card. 1,000 requests/month out of the box.
Get your free API key →