603 Area CodeManchester, NH
Area code 603 covers Manchester and nearby communities in New Hampshire, in the Eastern Time (ET) zone, home to about 653,000 people across 97 cities. It's the only area code for this region, so the three digits alone place the caller.
Overview
- Major City
- Manchester
- State
- New Hampshire (NH) – also serves VT
- Timezone
- Eastern Time (ET)
- Current Time
- Overlay
- No – unique area code
Where is area code 603?
Area code 603 serves part of Manchester, NH and the surrounding areas. It is a unique area code with no overlays.
Overview of the 603 Area Code
What is the 603 area code?
The 603 area code serves Manchester, New Hampshire. When you see a 603 number, it indicates a local number within this geographic area.
Why was area code 603 created?
The 603 area code was established to serve the Manchester region in New Hampshire. It provides telephone number coverage across 97 cities.
Geographic Coverage of the 603 Area Code
The 603 area code serves Manchester and surrounding areas in New Hampshire. It operates within the Eastern Time (ET) time zone. This area code covers several key cities, including:
- Manchester
- Nashua
- Concord
- Dover
- Rochester
- Keene
Got a call from a 603 number? It came from Manchester, NH. No other area code overlaps the 603 territory, so the prefix alone identifies where the caller is. Inside 603, Manchester holds about 18% of the population; the rest is split across 96 smaller cities.
Manchester Area Code Overview
The 603 area code provides comprehensive telephone coverage for Manchester and its surrounding communities. As the sole area code for this region, it uniquely identifies all local numbers within the service area.
What cities does area code 603 cover?
| City | State | Population | % of Area Code | % of City |
|---|---|---|---|---|
| Manchester | NH | 116,386 | 0% | 100% |
| Nashua | NH | 91,851 | 0% | 100% |
| Concord | NH | 44,674 | 1% | 100% |
| Dover | NH | 33,909 | 0% | 100% |
| Rochester | NH | 33,598 | 0% | 100% |
| Keene | NH | 23,036 | 0% | 100% |
| Portsmouth | NH | 22,938 | 0% | 100% |
| Derry | NH | 22,015 | 0% | 100% |
| Laconia | NH | 17,310 | 0% | 100% |
| Lebanon | NH | 15,389 | 0% | 100% |
* Sources: Population – U.S. Census Bureau PEP, Vintage 2024 (SUB-IP-EST2024-POP). Area code assignments – NANPA CO Code data. See our data methodology.
Has area code 603 been reported for unwanted calls?
Yes – 429 unwanted-call complaints were reported to the FTC for numbers showing a 603 area code (May 29 – Jul 2, 2026).
- 62% robocalls
- ↑ 14% vs prior period
Most-reported subjects
- Other35%151
- Dropped call or no message21%92
- Calls pretending to be government, businesses, or family and friends13%54
* Caller ID is easily spoofed, so these figures reflect the number shown on caller ID, not the caller's true location – an area code alone never identifies a caller. The FTC does not verify the facts in these complaints. Source: FTC Do Not Call (DNC) Reported Calls Data, retrieved 2026-07-05.
Which prefixes and exchanges belong to area code 603?
75% assigned to a telco
- 87% Landline
- 13% Wireless
- 0% Unknown
| Prefix | Usage | Carrier |
|---|---|---|
| (603)200- | Landline | Comcast Ip Phone |
| (603)202- | Landline | Omnipoint Miami E License |
| (603)203- | Wireless | New Cingular Wireless Pcs |
| (603)204- | Wireless | United States Cellular |
| (603)205- | Landline | Omnipoint Miami E License |
| (603)206- | Landline | Paetec Communications |
| (603)207- | Landline | Onvoy |
| (603)208- | Wireless | United States Cellular |
| (603)209- | Wireless | United States Cellular |
| (603)210- | Landline | Comcast Ip Phone |
Frequently Asked Questions about the 603 Area Code
Who called me from a 603 number?
A 603 number is assigned to Manchester, New Hampshire, so a call may come from there. But caller ID is easy to fake, and scammers often spoof a local 603 code to look nearby, so a 603 number doesn't prove the caller is local. Recently, 429 unwanted-call complaints were reported to the FTC for numbers showing the 603 code (62% flagged as robocalls). If you don't recognize the number, let it go to voicemail; a real caller will leave a message.
Is 603 a scam area code?
No area code is a scam on its own. 603 is a normal, officially assigned code for Manchester, New Hampshire. Spam callers spoof local codes to raise the odds you answer, so 603 on your caller ID says nothing about who is really calling. Recently, 429 unwanted-call complaints were reported to the FTC for numbers showing the 603 code (62% flagged as robocalls). Judge the call itself, not the area code.
Why do I keep getting calls from the 603 area code?
Repeated calls from different 603 numbers are usually spoofing: a robocaller rotates through 603 numbers so each call looks local and slips past simple blocks. Recently, 429 unwanted-call complaints were reported to the FTC for numbers showing the 603 code (62% flagged as robocalls). Blocking one number rarely helps; voicemail screening, your carrier spam filter, and the Do Not Call Registry work better.
Should I answer an unknown 603 number?
If you aren't expecting a 603 call, let it ring to voicemail. Legitimate callers leave a message, most robocallers hang up when no one picks up, and answering can mark your number as active and bring more calls.
How do I block calls from the 603 area code?
Block a single 603 number from your recent-calls list (iPhone: tap the number, then Block this Caller; Android: tap the number, then Block or report spam). To cut the volume, turn on Silence Unknown Callers on iPhone or spam protection on Android, enable spam filtering from your carrier, and register at DoNotCall.gov. Blocking the entire 603 code also stops legitimate local calls, so use it only as a last resort.
Where is area code 603?
Area code 603 covers Manchester and the surrounding area in New Hampshire, spanning 97 cities with about 653,209 residents. No other code overlays this region, so 603 alone identifies the area.
Is 603 a real area code?
Yes. 603 is an active code in the North American Numbering Plan, assigned by NANPA and in service for Manchester, New Hampshire. A real code can still show up on spoofed spam calls, so treat unknown 603 calls with normal caution.
What timezone is the 603 area code in?
The 603 area code is in the Eastern Time (ET). Because a number can be kept when someone moves or switches to VoIP, a specific 603 caller may not be in that zone.
How do I call a 603 number from abroad?
From outside the US, dial your country's exit code, then 1 (the US country code), then 603 and the seven-digit number. From a mobile phone you can usually just enter +1 603 followed by the number and let the phone add the exit code for you.