Area code 603 — New Hampshire
Area code 603 is in New Hampshire. Time zone, overlays, counties and ZIP codes.
| Location | New Hampshire (all) |
|---|---|
| State | New Hampshire |
| Status | In service · since 1947 |
| Time zone | Eastern · |
| Local dialing | 10 digits |
Counties (approximate)
BelknapBelknap CountyCarrollCarroll CountyCheshireCheshire CountyCoosCoos CountyGraftonGrafton CountyHillsboroughHillsborough CountyMerrimackMerrimack CountyOxford CountyRockinghamRockingham CountyStraffordStrafford CountySullivanSullivan County
ZIP codes in area code 603
Approximate: area code boundaries follow telephone rate centers, not ZIP codes.
03031 Amherst03032 Auburn03033 Brookline03034 Candia03036 Chester03037 Deerfield03038 Derry03040 East Candia03041 East Derry03042 Epping03043 Francestown03044 Fremont03045 Goffstown03046 Dunbarton03047 Greenfield03048 Greenville03049 Hollis03051 Hudson03052 Litchfield03053 Londonderry03054 Merrimack03055 Milford03057 Mont Vernon03060 Nashua03061 Nashua03062 Nashua03063 Nashua03064 Nashua03070 New Boston03071 New Ipswich03073 North Salem03076 Pelham03077 Raymond03079 Salem03082 Lyndeborough03084 Temple03086 Wilton03087 Windham03101 Manchester03102 Manchester
Format a 603 number
US numbers are written as (603) 555-0123 or 603-555-0123. From outside the US, dial +1 603 555 0123.
Is a call from 603 a scam?
An area code only tells you where a number was assigned. Caller ID can be faked (“spoofed”), so do not trust a call just because the area code looks local. Never share codes or payment details with unexpected callers.
Sources: NANPA via NumberResearch.org (CC BY 4.0); place names and history from Wikipedia (CC BY-SA 4.0). See data sources.