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United States > New Hampshire > Jefferson > Area Code 603
| Area Code: | 603 |
| State: | New Hampshire |
| City: | Jefferson |
| Country: | United States |
Supported Exchanges in Area Code 603
| Exchange | County | Carrier |
|---|---|---|
| 603-278 | Coos | Bretton Woods Tel Co |
| 603-390 | Coos | Brooks Fiber Communications Of |
| 603-586 | Coos | Level 3 Communications, Llc - |