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Hamden, CT is currently assigned two area codes 203 and 475. Hamden, 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 Hamden 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 Hamden, CT today was put into service on December 12, 2009. Area code 203 originally covered the
entire state of Connecticut, including Hamden, when it was established in 1947.
In addition to Hamden, 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. |
