Census Data API User Guide

The purpose of this user guide is to instruct developers and researchers on how to use the Census Data Application Programming Interface (API) to request data from U.S. Census Bureau datasets.

Help & Contact Us
  • Overview
  • What is the API
  • Query Limits
  • API Key
  • Available Data
  • Core Concepts
  • Example API Queries
  • Ucgid Predicate
  • Help & Contact Us

Help & Contact Us

Resources for Learning More

How-To Materials for Using the Census API

Dataset Discovery Tool:

  • List of Census API Datasets: api.census.gov/data.html?key=your key here
  • List of Census API Datasets in XML: api.census.gov/data.xml?key=your key here
  • List of Census API Datasets in JSON: api.census.gov/data.json?key=your key here

Census Data API Developers Page:

Convert JSON to CSV data:

Guide to Accessing Census Data API via Python

Census Bureau Geography

Contact Us

If you have additional questions about the Census Data API, contact us by emailing [email protected].

Related Information

Page Last Revised - May 14, 2026