HUD User Housing Data

The HUD User API provides U.S. Department of Housing and Urban Development data including Fair Market Rents (FMR) by area, Income Limits at 30/50/80% thresholds, USPS Crosswalk data mapping ZIP codes to census tracts, counties, CBSAs, and congressional districts, and Comprehensive Housing Affordability Strategy (CHAS) data. Authentication uses a free bearer token. Rate limited to 60 queries per minute.

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What You Can Query

You can look up Fair Market Rents by county or metro area (fmr/data), retrieve income limits at 30%, 50%, and 80% thresholds by household size (il/data), and map ZIP codes to census tracts, counties, CBSAs, and congressional districts using the USPS crosswalk.

What You Can Do

Looking up Fair Market Rent by ZIP code for rental market analysis

Comparing income limits across metropolitan areas for affordable housing planning

Mapping ZIP codes to census tracts and counties using USPS crosswalk data

Analyzing residential vacancy rates from USPS delivery data

Researching housing affordability thresholds for community development

Building rental pricing tools with government benchmark data

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