= HUD USPS ZIP Code Crosswalk = The '''HUD USPS ZIP Code Crosswalk''' is a crosswalk of geographic classifications, principally between those used by HUD and the [[UnitedStates/PostalService|USPS]]. <> ---- == Description == The crosswalks are maintained by the department's '''Office of Policy Development and Research''' ('''PD&R'''). Principally, they are used to attach ZIP code-level data to the geographies that the department uses. Alongside ZIP codes, the [[UnitedStates/PostalService|USPS]]-labeled city name and state abbreviation are included. ---- == Usage == The crosswalks can be accessed [[https://www.huduser.gov/portal/datasets/usps_crosswalk.html|online]]. A login and/or API key is necessary. Export options include: * ZIP codes to [[UnitedStates/CensusBureau#Tracts|Census tracts]] * ZIP codes to counties * ZIP codes to county subdivisions * ZIP codes to [[UnitedStates/CensusBureau#Core_Based_Statistical_Areas|CBSAs]] * ZIP codes to CBSA divisions * ZIP codes to [[UnitedStates/Congress|congressional districts]] * and the inverses of the above relations Note that inverse crosswalks are available because there is no 1-to-1 relation between these geographies. The 'ZIP-TRACT' crosswalk should be used to allocate ZIP code-level data to Census tracts, while the 'TRACT-ZIP' crosswalk should be used to allocate Census tract-level data to ZIP codes. Furthermore, the crosswalks are updated on a quarterly basis. Data is available going back to 2010. ---- == History == The crosswalks are updated for new Census tract definitions as they become available. 2010 census tracts are used from 2012 Q1. 2020 census tracts are used from 2023 Q1. ---- CategoryRicottone