Look up any phone number starting with 603 to identify the owner name, address, spam reports, and more. The 603 area code is a telephone area code serving all of New Hampshire.
Enter a full 10-digit number to identify the caller and whether it has been reported as spam.
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Phone numbers with the 603 area code prefix originate from across the entire state of New Hampshire, as it is the sole area code for the state.
Although an overlay area code was once anticipated for New Hampshire, with a plan to activate a second area code by 2013, the need has been deferred until at least 2032 due to changes in allocation policies and number reclamation. However, ten-digit dialing became mandatory for area code 603 on October 24, 2021. This transition was required because the 988 central office code was designated nationwide as a dialing code for the National Suicide Prevention Lifeline, creating a conflict for exchanges that previously allowed seven-digit dialing.
Area code 603 is a general purpose code which was placed in service on January 1, 1947.
Our New Hampshire phone number lookup for the 603 area code analyzes the three-digit prefix to identify the initially assigned telecommunications company and rate center. This prefix code data may help to determine the U.S. carrier, New Hampshire geographic region, and local calling area associated with the phone number.
Phone numbers follow the following structure under the North American Numbering Plan:
Understanding the area code can help you determine if a call is local to your area. However, keep in mind that due to mobile number portability and VoIP services, the caller may be anywhere in the United States, so it’s best to search for the most recent phone number details.
| Company | Number of Prefixes |
|---|---|
| CONSOLIDATED COMM OF NO. NEW ENGLAND-NH | 222 |
| BELL ATLANTIC MOBILE, INC | 49 |
| UNITED STATES CELLULAR - NH | 24 |
| NEW CINGULAR WIRELESS PCS, LLC - DC | 22 |
| SPRINT SPECTRUM, L.P. | 21 |
| COMCAST IP PHONE, LLC | 16 |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NH | 16 |
| LEVEL 3 COMMUNICATIONS, LLC - NH | 14 |
| CHOICE ONE OF NEW HAMPSHIRE, INC. | 13 |
| PAETEC COMMUNICATIONS, INC. - NH | 11 |
| FREEDOM RING COMMUNICATIONS, LLC | 10 |
| CONVERSENT COMMUNICATIONS OF NEW HAMPSHIRE, LLC | 9 |
| OMNIPOINT MIAMI E LICENSE, LLC | 9 |
| LIGHTSHIP TELECOM, LLC - NH | 7 |
| KEARSARGE TEL. CO. | 6 |
| GRANITE STATE TEL., INC. | 4 |
| MERRIMACK CO. TELEPHONE CO., DBA CONTOOCOOK VALLEY | 4 |
| MERRIMACK COUNTY TEL. CO. | 4 |
| UNION TEL. CO. | 4 |
| CRC COMMUNICATIONS OF MAINE, INC. - NH | 3 |
| CTC COMMUNICATIONS CORP. - NH | 3 |
| AT&T - LOCAL | 2 |
| OTEL TELEKOM, INC. - NH | 2 |
| PEERLESS NETWORK OF NEW HAMPSHIRE, LLC - NH | 2 |
| TELEPORT COMMUNICATIONS AMERICA, LLC - NH | 2 |
| BANDWIDTH.COM CLEC, LLC - NH | 1 |
| BROADVIEW NETWORKS, INC. - NH | 1 |
| CHARTER FIBERLINK NH-CCO-LLC - NH | 1 |
| CONSOLIDATED COMM ENTERPRISE SERVICES INC | 1 |
| CONSOLIDATED COMMUNICATIONS OF MAINE COMPANY | 1 |
| DSCI, LLC | 1 |
| DUNBARTON TEL. CO. | 1 |
| ENHANCED COMMUNICATIONS OF NORTHERN NEW ENGLAND-NH | 1 |
| HOLLIS TELEPHONE COMPANY, INC. | 1 |
| IDT AMERICA, CORP. - NH | 1 |
| METROPCS, INC. | 1 |
| ONVOY SPECTRUM, LLC | 1 |
| ONVOY, LLC - NH | 1 |
| TDS METROCOM, LLC - NH | 1 |
| TELNYX LLC | 1 |
| WILTON TEL. CO. | 1 |
Carrier names have been updated from their original FCC assignments to reflect current companies following mergers, acquisitions, and rebranding. Updates were determined using AI-assisted research and may not be accurate or reflect up to date changes. This data is provided without warranties of accuracy or completeness.
| Rate Center | Number of Prefixes |
|---|---|
| MANCHESTER | 52 |
| NASHUA | 43 |
| CONCORD | 28 |
| DERRY | 23 |
| PORTSMOUTH | 22 |
| DOVER | 19 |
| SALEM | 16 |
| LACONIA | 15 |
| MERRIMACK | 13 |
| EXETER | 12 |
| KEENE | 12 |
| LEBANON | 8 |
| HANOVER | 7 |
| MILFORD | 7 |
| ROCHESTER | 7 |
| BEDFORD | 6 |
| HAMPTON | 5 |
| W LEBANON | 5 |
| CLAREMONT | 4 |
| LITTLETON | 4 |
| NEWPORT | 4 |
| NO CONWAY | 4 |
| PLAISTOW | 4 |
| RAYMOND | 4 |
| SUNCOOK | 4 |
| CAMPTON | 3 |
| DURHAM | 3 |
| EPPING | 3 |
| HAMPSTEAD | 3 |
| NOWOODSTOK | 3 |
| PETERBROGH | 3 |
| PLYMOUTH | 3 |
| WOLFEBORO | 3 |
| BARRINGTON | 2 |
| BERLIN | 2 |
| CANDIA | 2 |
| COLEBROOK | 2 |
| CONWAY | 2 |
| CTROSSIPEE | 2 |
| CTRSANDWIH | 2 |
| FARMINGTON | 2 |
| GLNTNIRWRS | 2 |
| GOFFSTOWN | 2 |
| GORHAM | 2 |
| GREENFIELD | 2 |
| HILLSBORO | 2 |
| HOLLIS | 2 |
| JAFFREY | 2 |
| JEFFERSON | 2 |
| KINGSTON | 2 |
| LANCASTER | 2 |
| LYME | 2 |
| MEREDITH | 2 |
| NEW BOSTON | 2 |
| NORTHWOOD | 2 |
| PELHAM | 2 |
| PLAINFIELD | 2 |
| RYE BEACH | 2 |
| SEABROOK | 2 |
| SO HAMPTON | 2 |
| SUNAPEE | 2 |
| TILTON | 2 |
| WARNER | 2 |
| WINCHESTER | 2 |
| WOODSVILLE | 2 |
| ALSTEAD | 1 |
| ALTON | 1 |
| ANDOVER | 1 |
| ANTRIM | 1 |
| ASHLAND | 1 |
| BARTLETT | 1 |
| BELMONT | 1 |
| BETHLEHEM | 1 |
| BOSCAWEN | 1 |
| BRADFORD | 1 |
| BRISTOL | 1 |
| CANAAN | 1 |
| CANTERBURY | 1 |
| CENTER HBR | 1 |
| CHARLESTN | 1 |
| CHATHAM | 1 |
| CHESTER | 1 |
| CHICHESTER | 1 |
| CONTOOCOOK | 1 |
| CTRBARNSTE | 1 |
| DANBURY | 1 |
| DEERFIELD | 1 |
| DUBLIN | 1 |
| DUNBARTON | 1 |
| ENFIELD | 1 |
| EPSOM | 1 |
| ERROL | 1 |
| FITZWILLIM | 1 |
| FRANCONIA | 1 |
| FRANKLIN | 1 |
| GREENVILLE | 1 |
| GROVETON | 1 |
| HANCOCK | 1 |
| HARRISVL | 1 |
| HENNIKER | 1 |
| HINSDALE | 1 |
| HLLSBUPVLG | 1 |
| JACKSON | 1 |
| LISBON | 1 |
| MADISON | 1 |
| MARLBOROGH | 1 |
| MARLOW | 1 |
| MELVIN VLG | 1 |
| MERIDEN | 1 |
| MILAN | 1 |
| MILTON | 1 |
| MILTON ML | 1 |
| MONROE | 1 |
| NEW DURHAM | 1 |
| NEW LONDON | 1 |
| NEWMARKET | 1 |
| NO STRATFD | 1 |
| NO WALPOLE | 1 |
| ORFORD | 1 |
| PENACOOK | 1 |
| PIERMONT | 1 |
| PIKE | 1 |
| PITTSBURG | 1 |
| PITTSFIELD | 1 |
| RINDGE | 1 |
| RUMNEY | 1 |
| SALISBURY | 1 |
| SANBORNVL | 1 |
| SOMERSWTH | 1 |
| SPOFFORD | 1 |
| SULLIVAN | 1 |
| SUTTON | 1 |
| TAMWORTH | 1 |
| TROY | 1 |
| TWIN MT | 1 |
| WALPOLE | 1 |
| WARREN | 1 |
| WASHINGTON | 1 |
| WCHESTEFLD | 1 |
| WEARE | 1 |
| WESTMORELD | 1 |
| WHITEFIELD | 1 |
| WILTON | 1 |
| WSTEWATSTN | 1 |