One of the many challenges that social science researchers and practitioners face is the difficulty of relating United States Postal Service (USPS) ZIP codes to Census Bureau geographies. HUD is not supplying USPS ZIP Code Crosswalks for 2000 Census geographies beyond the fourth quarter of 2011. USPS ZIP Code Crosswalk files are now available for 2010 Census geographies level beginning with the first quarter of 2012. Note: ZIP to Congressional District and Congressional District to ZIP Crosswalk Files are now available To create an account and get an access token, please visit the API page here. With this API, developers can easily access and customize crosswalk data for use in existing applications or to create new applications. HUD’s Office of Policy Development and Research (PD&R) is pleased to announce that HUD-USPS ZIP Code Crosswalk data are now available via an application programming interface (API).
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