603 Area Code
New Hampshire (statewide), New Hampshire
Area code 603 is located in New Hampshire (statewide), New Hampshire. It covers Manchester, Nashua, and surrounding areas in the Eastern time zone (UTC-5). Administered by NANPA.
Where is area code 603?
Area code 603 is located in New Hampshire (statewide), New Hampshire. It covers Manchester, Nashua, and surrounding areas in the Eastern time zone (UTC-5).
Cities Covered by Area Code 603
Area code 603 primarily serves the New Hampshire (statewide) area of New Hampshire. The exact coverage includes Manchester, Nashua, and Concord, along with surrounding communities and suburbs.
Time Zone
Eastern Time — UTC-5
Area code 603 operates in the Eastern Time Zone. When calling 603 numbers from a different time zone, be sure to account for the time difference to reach people during business hours.
About Area Code 603
Area code 603 was introduced in 1947 as a geographic area code serving New Hampshire (statewide), New Hampshire. It remains the primary area code for this region. Area codes are administered by NANPA (North American Numbering Plan Administration), the organization responsible for managing phone number resources in the US and Canada.