ZipCode Lookup web service features several functions for US zipcodes and distance manipulations: zip code lookup by distance, zip code coordinates, distance between zip codes.

The following operations are supported. For a formal definition, please review the Service Description.

• GetThreeDigitZipCodesWithin
  Returns a list of zip codes within a specified distance from a given zip code. Parameters: zip - 5 digit zip code or Canadian postal code (M3H, M3H 6A7), distance - distance in miles.
• GetPlacesInside
  Returns a list of geo places inside a given zip code. Parameters: zip - 5 digit zip code or Canadian postal code (M3H, M3H 6A7), state - 2 letter state code (not required for zip codes).
• GetZipCodeCoordinates
  Returns a centroid point of the zip code in both radians and degrees. Parameters: zip - 5 digit zip code or Canadian postal code (M3H, M3H 6A7).
• GetDistanceBetweenZipCodes
  Returns a distance in miles between two zip codes. Parameters: zip1 - 5 digit zip code or Canadian postal code (M3H, M3H 6A7), zip2 - 5 digit zip code or Canadian postal code (M3H, M3H 6A7).
• GetZipCodesWithinFiltered
  Returns a list of zip codes within a specified distance from a given zip code. Parameters: zip - 5 digit zip code or Canadian postal code (M3H, M3H 6A7), distance - distance in miles, filter - string to filter results, filterType - type of filter (StartsWith, EndsWith, Anywhere, None).
• GetZipCodesWithin
  Returns a list of zip codes within a specified distance from a given zip code. Parameters: zip - 5 digit US zip code or Canadian postal code (M3H, M3H 6A7), distance - distance in miles.
• GetAllUserPlaces
  Returns an array of all user-defined places.
• GetUserPlacesWithin
  Returns a list of user-defined places within a specified distance from a given place. Parameters: zip - 5 digit zip code or Canadian postal code (M3H, M3H 6A7), state - 2 letter state code (not required for zip codes), distance - distance in miles, category - an optional category, if not empy only user-defined places that match the category will be returned.
• SaveUserPlaces
  Saves user-defined places.