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Area code 603

Area code 603 serves New Hampshire, including Manchester, Nashua and Concord (Eastern time). It has been in service since January 1, 1947.

Numbers starting with 603 drew 1,106 reports to the FTC from Aug 14, 2026 to Nov 11, 2026 and 565 complaints to the FCC since November 2023. The number on your screen can be faked, so a 603 number proves nothing about where a call came from.

Location
New HampshireBoston-Cambridge-Newton, MA-NH Metropolitan Statistical Area
Time zone
Eastern
In service since
January 1, 1947
Overlay
None: the only code for its area
Local calls
Dial 10 digitsArea code needed, even next door
Exchanges in use
752 of 792held by 49 carriers
Projected to run out
1Q 2052NANPA forecast 2026.2

Complaints about 603 numbers

Reports where the number on the consumer's caller ID (or, for the FCC, the number the caller asked them to call back) starts with 603. These are counts of what people reported; the agencies do not verify them.

FTC reports, Aug 14, 2026 to Nov 11, 2026

1,106

FCC complaints since November 2023

565

Different 603 numbers reported

1,474

FCC complaints naming a 603 number, by month

November 2023 to October 2026. Source: FCC Consumer Complaints Data.

Show as a table
MonthComplaints
November 202324
December 202317
January 202435
February 20249
March 20249
April 202415
May 202421
June 202417
July 202426
August 202410
September 202412
October 20246
November 202424
December 202418
January 202535
February 20259
March 202514
April 202534
May 202517
June 202515
July 202510
August 202523
September 202510
October 20250
November 202510
December 20257
January 202611
February 202611
March 20269
April 20269
May 20269
June 20269
July 202615
August 202619
September 202615
October 202627

What people said 603 calls were about

Subjects picked in FTC reports, August 14, 2026 to November 11, 2026. 639 of 1,106 reports were robocalls.

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SubjectReports
Other557
Dropped call or no message102
Calls pretending to be government, businesses, or family and friends88
Reducing your debt (credit cards, mortgage, student loans)80
Medical and prescriptions58
Vacation and timeshares24

Most reported 603 numbers

Numbers with at least five reports from three or more places in the last twelve months. Many of them are likely spoofed.

Places served by 603

NANPA lists 147 rate centers for 603. A rate center is the town or district a block of numbers is tied to for billing; sorted here by how many exchanges each holds.
  • Manchester80
  • Nashua58
  • Concord39
  • Derry29
  • Dover29
  • Portsmouth28
  • Merrimack23
  • Salem20
  • Laconia19
  • Keene17
  • Rochester16
  • Exeter15
  • Milford11
  • Plymouth10
  • Suncook9
  • Claremont8
  • Hampton8
  • Hanover8
  • Lebanon8
  • West Lebanon8
  • Durham7
  • Plaistow7
  • Bedford6
  • Berlin6
Show all 147 rate centers

Littleton, Meredith, Peterborough, Lancaster, Newport, North Conway, Raymond, Sunapee, Center Ossipee, Colebrook, Conway, Goffstown, Hampstead, New Boston, North Woodstock, Seabrook, Tilton, Woodsville, Barrington, Bristol, Campton, Canaan, Candia, Danbury, Deerfield, Epping, Greenfield, Hollis, Jaffrey, Kingston, Lyme, Milan, Newmarket, Orford, Pelham, Pike, Rye Beach, Somersworth, South Hampton, Tamworth, West Chesterfield, Wolfeboro, Alstead, Alton, Andover, Antrim, Ashland, Barnstead, Bartlett, Belmont, Boscawen, Canterbury, Center Barnstead, Center Harbor, Center Sandwich, Charlestown, Chester, Chichester, Enfield, Epsom, Errol, Farmington, Franklin, Gilmanton Iron Works, Gorham, Greenville, Henniker, Hillsboro, Jackson, Jefferson, Lisbon, Meriden, Milton, Monroe, New Durham, New London, Northwood, Penacook, Plainfield, Rindge, Salisbury, Sanbornville, Spofford, Sutton, Troy, Walpole, Warner, Washington, Winchester, Bethlehem, Bradford, Bretton Woods, Chatham, Contoocook, Dublin, Dunbarton, East Conway, Fitzwilliam, Franconia, Groveton, Hancock, Harrisville, Hillsborough Upper Village, Hinsdale, Madison, Marlborough, Marlow, Melvin Village, Milton Mills, North Stratford, North Walpole, Piermont, Pittsburg, Pittsfield, Rumney, Sullivan, Twin Mountain, Warren, Weare, West Stewartstown, Westmoreland, Whitefield, Wilton.

Phone companies holding 603 exchanges

Each exchange (the three digits after the area code) is assigned to one carrier. 80% of these exchanges are pooled: their numbers are handed out in blocks of 1,000 to other carriers, so the holder below is not always the company serving a given number.

Exchanges held, top 8 of 49 carriers

NANPA central office code assignments, file of November 11, 2026.

Show as a table
Carrier (legal name)Exchanges
Consolidated Comm of No. New England-NH246
Bell Atlantic Mobile, Inc74
Omnipoint Miami E License, LLC60
Paetec Itel, LLC58
Mcimetro Access Transmission Services LLC - NH44
Comcast IP Phone, LLC40
Level 3 Communications, LLC - NH37
New Cingular Wireless PCS, LLC - DC34

When today's 603 exchanges were assigned

Exchanges still assigned, by year of assignment. Exchanges returned since are not counted.

Show as a table
YearExchanges
200129
200229
20034
20045
20052
20066
20073
20086
200915
20103
20113
20125
20132
20141
20156
20165
20175
20186
20192
20208
20218
202211
20236
20241

Check a 603 number

A check shows the carrier and rate center of the number's exchange and every FTC and FCC report about that exact number. Why the number on screen can be fake.

NANPA area code database and central office code file of November 11, 2026; FCC complaints November 1, 2023 to November 11, 2026; FTC reports August 14, 2026 to November 11, 2026. How the data is used.

Official sources (7)Show