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Guilford, CT is currently assigned two area codes 203 and 475. Guilford, CT utilizes an area code overlay in
which area codes 203 and 475 serve the same geographic area. Ten digit dialing (area code + seven digit number) is necessary in Guilford because two different homes in the same geographic area can have the
same seven digit phone number but each would have a different area code. The area code overlay which is in use in Guilford, CT today was put into service on December 12, 2009. Area code 203 originally
covered the entire state of Connecticut, including Guilford, when it was established in 1947.
In addition to Guilford, CT area codes 203 and 475 serve the major communities of Bridgeport, Danbury,
East Haven, Meriden, Milford, Naugatuck, New Haven, Norwalk, Shelton, Stamford, Trumbull, Waterbury, West Haven and Westport. |
