Area Code 603
603 area code is being used for dialing/telecommunication purposes in New Hampshire, covering 8 major cities and 11 counties, according to (NANP) North American Numbering Plan for 3-digit Numbering Plan Area (NPA) code. All the areas using NPA code 603 is part of EST (Eastern Standard Time) timezone.
603 Area Code Covers 8 Cities
Check this below table to know 8 major cities (having more than 20,000 population) in New Hampshire using numbering plan area code 603 for dialing/telecommunication purposes.
| City | ZIP Codes | Population |
|---|---|---|
| Concord, NH | 5 | 44,049 |
| Derry, NH | 1 | 23,027 |
| Dover, NH | 4 | 32,849 |
| Keene, NH | 3 | 22,907 |
| Manchester, NH | 7 | 115,037 |
| Nashua, NH | 4 | 90,943 |
| Portsmouth, NH | 4 | 22,138 |
| Rochester, NH | 4 | 32,573 |
11 Counties Using 603 as Area Code
603 area code is being used in 11 counties of New Hampshire for dialing/telecommunication purposes.
- Belknap County, NH
- Carroll County, NH
- Cheshire County, NH
- Coos County, NH
- Grafton County, NH
- Hillsborough County, NH
- Merrimack County, NH
- Rockingham County, NH
- Strafford County, NH
- Sullivan County, NH
11 More NPA Codes Related to Area Code 603
1 or more of these 11 NPA codes are being used in the same or adjacent states of New Hampshire in the United States.
- 207 Area Code
- 339 Area Code
- 351 Area Code
- 413 Area Code
- 508 Area Code
- 617 Area Code
- 774 Area Code
- 781 Area Code
- 802 Area Code
- 857 Area Code
- 978 Area Code