Caller ID for
Area code 603
Area code 603 Manchester, New Hampshire
Area code 603 is one of the original 1947 area codes, in New Hampshire, with numbers assigned in Manchester, Nashua, Concord and 75 more places. It’s 12:13 AM there now.
- State
- New HampshireThe only area code in New Hampshire
- Time zone
- Eastern12:13 AM there now
- Exchanges
- 75278 places
- Overlay
- NoneThe only code for its area
- No sign-up
- We never contact the number
- Spam risk included
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Where area code 603 is
Numbers in 603 are assigned to 78 places in 10 counties: Hillsborough County, Rockingham County, Merrimack County, Strafford County, Grafton County, Belknap County, plus 4 more.
No single place dominates: Manchester, the largest, has 11% of the exchanges.
- Manchester80
- Nashua58
- Concord39
- Derry29
- Dover29
- Portsmouth28
- Laconia19
- Keene17
- Rochester16
- Exeter15
- Milford11
- Plymouth10
- Suncook9
- Hanover8
- Claremont8
- Lebanon8
- Hampton8
- Durham7
- Berlin6
- Center Ossipee6
- Littleton6
- Meredith6
- North Woodstock6
- Peterborough6
Phone companies in 603
752 blocks of numbers in 603 are held by 45 phone companies. The most belong to Consolidated Communications (248), Bell Atlantic Mobile (74) and Paetec Itel (58).
A mix: about 26% wireless, 42% local phone and cable and 32% other carriers, including internet phone services.
A block’s holder is the company it was first assigned to; numbers can move to other carriers since.
History and overlays
603 has been in service since 1947, when the first North American area codes were set up.
26 new exchanges were assigned since 2021, the latest in January 2024.
Calling 603
It’s 12:13 AM Eastern time in 603 right now.
From elsewhere in the U.S., dial 1, 603 and the 7-digit number.
Nearby area codes
603 is New Hampshire’s only area code.
- 351 · Lowell, MA · about 44 mi
- 978 · Lowell, MA · about 45 mi
- 781 · Waltham, MA · about 62 mi
- 617 · Boston, MA · about 64 mi
- 857 · Boston, MA · about 65 mi
- 339 · Lynn, MA · about 65 mi
From the North American Numbering Plan Administrator’s area code and exchange records (10/22/2026) and U.S. Census place and county names. Places and companies are where number blocks were assigned, not where anyone lives or which carrier a number uses today.
Map of the 603 area code
Map of the 603 area code around Manchester, Nashua and Concord, New Hampshire.
Cities on the map
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Questions about 603
Where is area code 603?
In New Hampshire, covering Manchester, Nashua and Concord and other places across 10 counties.
What time zone is 603 in?
Eastern time. It was 12:13 AM there when this page loaded.
Is 603 an overlay?
No. 603 is the only area code for its area right now.
Which phone companies have 603 numbers?
45 companies hold blocks; the most belong to Consolidated Communications, Bell Atlantic Mobile and Paetec Itel. About 26% of blocks are wireless.
Is 603 running out of numbers?
Not on record. 26 new exchanges have been assigned since 2021.