603 Area Code Information
State: NH
Largest City in Area: MANCHESTER
Where is Area Code 603? Area code (603) is in the state of NH. Below, are the major cities in the area code (603).
Major Cities in 603
- MANCHESTER, NH (541,034)
- NASHUA, NH (371,318)
- CONCORD, NH (221,118)
- DERRY, NH (187,388)
- DOVER, NH (178,575)
- ROCHESTER, NH (153,545)
- PORTSMOUTH, NH (134,737)
- MERRIMACK, NH (133,043)
- SALEM, NH (120,465)
- HUDSON, NH (118,790)
Zip Codes in 603
- 03031
- 03032
- 03033
- 03034
- 03036
- 03037
- 03038
- 03040
- 03041
- 03042
- 03043
- 03044
- 03045
- 03046
- 03047
- 03048
- 03049
- 03051
- 03052
- 03053