A method, system and computer readable medium are provided for defining a service area served by a service location of a telecommunications network customer. The method includes ascertaining a geographic designator of a geographic area. The geographic area includes a plurality of geographic sub-areas that each correspond to a geographic sub-designator. The method also includes determining whether any two of the plurality of geographic sub-areas are not served by the same service location. When any two of the plurality of geographic sub-areas are not served by the same service location, the service area is defined by only the sub-designators corresponding to the geographic sub-areas served by the service location. When each of the plurality of geographic sub-areas are served by the same service location, the service area is defined by the geographic designator.