203 Area Code
Western Connecticut, Connecticut
Area code 203 is located in Western Connecticut, Connecticut. It covers Bridgeport, New Haven, and surrounding areas in the Eastern time zone (UTC-5). Administered by NANPA.
Where is area code 203?
Area code 203 is located in Western Connecticut, Connecticut. It covers Bridgeport, New Haven, and surrounding areas in the Eastern time zone (UTC-5).
Area code 203 is overlaid by area code 475. Both codes serve the same geographic region and require 10-digit dialing for local calls.
Cities Covered by Area Code 203
Area code 203 primarily serves the Western Connecticut area of Connecticut. The exact coverage includes Bridgeport, New Haven, and Stamford, along with surrounding communities and suburbs.
Time Zone
Eastern Time — UTC-5
Area code 203 operates in the Eastern Time Zone. When calling 203 numbers from a different time zone, be sure to account for the time difference to reach people during business hours.
About Area Code 203
Area code 203 was introduced in 1947 as a geographic area code serving Western Connecticut, Connecticut. As demand for phone numbers grew, overlay code 475 was added to the same region, requiring 10-digit dialing for local calls. Area codes are administered by NANPA (North American Numbering Plan Administration), the organization responsible for managing phone number resources in the US and Canada.