HUD USPS ZIP CODE CROSSWALK FILES
HUD’s Office of Policy Development and Research [PD&R] announced that HUD-USPS ZIP Code Crosswalk data are now available via an application programming interface [API]. With this API, developers can easily access and customize crosswalk data for use in existing applications or to create new applications. To create an account and get an access token, please visit the API page here: https://www.huduser.gov/portal/dataset/uspszip-api.html.