HUD Fair Market Rents (FMR) for a US county or state — HUD’s annual gross-rent estimate (rent + utilities) by bedroom size (efficiency through 4-bedroom), the basis for Housing Choice Voucher payment standards and other HUD programs. Look up by 5-digit county FIPS (returns the county/metro rents, broken out per ZIP where HUD publishes Small Area FMRs) or by 2-letter state (returns every metro area + county). Optional year (defaults to latest). Source: HUD USER FMR API (US public domain).