United States Census Bureau · JSON Structure

Census Data Api Response Structure

Structure documentation for the Census Data API 2D array response format

Type: array Properties: 0
DemographicsFederal-GovernmentOpen DataStatisticsEconomicsPopulation

Census Data Api Response Structure is a JSON Structure definition published by United States Census Bureau.

Meta-schema:

JSON Structure

Raw ↑
{
  "title": "Census Data API Response Structure",
  "description": "Structure documentation for the Census Data API 2D array response format",
  "type": "array",
  "rows": [
    {
      "index": 0,
      "name": "Header Row",
      "type": "array<string>",
      "description": "Column names: variable names as requested in the ?get= parameter, followed by geography identifier columns (state, county, tract, etc.)"
    },
    {
      "index": "1+",
      "name": "Data Row(s)",
      "type": "array<string|null>",
      "description": "Data values corresponding to the header row. Values are always strings. Geography FIPS codes appear as trailing columns."
    }
  ],
  "notes": [
    "All values are returned as strings, including numeric statistics",
    "Missing or suppressed values are returned as null",
    "Geographic FIPS codes are always appended at the end of each row",
    "Estimate variables end in E (e.g., B01003_001E), margin of error variables end in M",
    "Maximum 50 variables per request"
  ]
}

Work with this as data

Every JSON Structure here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for json structure

4 MCP tools reach this
  • find_json_structuresBrowse and filter every JSON Structure in the catalog.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
This JSON Structure
curl "https://apis.io/api/v1/json-structures/census-data-api-response-structure"
All json structure
curl "https://apis.io/api/v1/json-structures?limit=25"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

A second provider on the same verified email joins the account you already have.