About this number
(773) 503 is a wireless/mobile based telephone number operated by T-Mobile Usa, Inc. and is located in zip code 60631 in the city of Chicago, Illinois, which is in Cook County, and is in the Midwest. It has a Number Planning Area (NPA - also known as an Area Code) of 773 and Network Numbering Exchange (NXX - also known as a prefix) of 503. It has an Operating Company Number (OCN) of 6529. A Common Language Location Identifier (CLLI) of CHCGILMFCM1. As well as a Local access and transport area (LATA) of 358. It was first assigned for usage on 11/17/2004. Zip code 60631 has a population of 28,641 as of the 2010 census.