The 603 area code is a telephone area code serving all of New Hampshire. To start a free reverse phone lookup, simply enter the full 10-digit number (including the 603 area code) below and access available caller information such as name, address, and more.
Federal Data
State Data
County Data
City Data
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 reverse phone lookup will analyze the three-digit prefix of any 603 area code phone number and will show which telecommunications company and rate center it was initially assigned to. 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.
| 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 |
| 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 |
New Hampshire Reverse Lookup ➜