Lookup US ZIP Codes and Canadian Postal Codes. Lookup 2000 US Cenus Info for 5 digit US ZIP Codes. Lookup US ZIP Codes and Canadian Postal Codes by City and State or Province Calculates the distance (in miles) between two zip or postal codes. Finds the zip or postal code that is closest to a given point. Finds the zip or postal codes within a given radius (in miles) from a given ZIP or Postal code centroid. Finds the zip or postal codes within a given radius (in miles) from a given point. Gets all status codes a method in the service might return. Get all statuses this service might return. Get information about the web service