About this number
(203) 453 is a landline based telephone number operated by Southern New England Telephone and is located in zip code 06437 in the city of Guilford, Connecticut, which is in New Haven County, and is in the Northeast. It has a Number Planning Area (NPA - also known as an Area Code) of 203 and Network Numbering Exchange (NXX - also known as a prefix) of 453. It has an Operating Company Number (OCN) of 9147. A Common Language Location Identifier (CLLI) of GUFDCT00DS0. As well as a Local access and transport area (LATA) of 920. Zip code 06437 has a population of 22,375 as of the 2010 census.