Area Code -603-### Prefixes List

• Country: United States
• Capital City: New Hampshire (NH)
• Time Zone: 603

Telephone numbers whose prefix is 603
Area codes starting with 603
Prefix: 603 corresponds to a telephone number Landline whose location (town, department, region or country) is New Hampshire (NH)

Check out the list of numbers starting with 603 in the United States. With our directory, you can check out comments about this telephone number or leave your own comment.