Look up HUD Fair Market Rents (FMR) for a rental unit by area using the HUD FMR API
domain: huduser.gov · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Register at huduser.gov, request access to the FMR/IL Datasets API, and confirm the account
Generate a bearer access token from the account's 'Create New Token' page
Call GET https://www.huduser.gov/hudapi/public/fmr/data/{entityid} with the FMR area or state/county FIPS code, sending the token in the Authorization: Bearer header
Parse the response for efficiency (studio) through four-bedroom FMR values for the requested year
If starting from a street address or ZIP code, first resolve it to an FMR area using the HUD-USPS ZIP crosswalk before calling the FMR endpoint
Known gotchas
The FMR API returns data at the FMR-area level, not by ZIP code, so a ZIP-to-FMR-area crosswalk lookup is a required first step, not optional
FMR values update annually (federal fiscal year); cache results with the fiscal year as part of the cache key to avoid serving stale figures
Small Area FMRs (ZIP-code-level, used in some metros) are a separate dataset/endpoint from standard metro/county FMRs and must not be conflated
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