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United States > New Hampshire > Hillsboro > Area Code 603
| Area Code: | 603 |
| State: | New Hampshire |
| City: | Hillsboro |
| Country: | United States |
Supported Exchanges in Area Code 603
| Exchange | County | Carrier |
|---|---|---|
| 603-464 | Hillsborough | Merrimack County Tel Co Dba Co |
| 603-478 | Hillsborough | Granite State Tel Inc |
| 603-680 | Hillsborough | United States Cellular Corp. - |