Area codes · +1
Area code 603
Area code 603 is centred on Manchester, New Hampshire. We hold 5,960 allocated blocks for it across 147 rate centres, split 40% mobile, 45% landline and 15% VoIP.
The towns inside area code 603
Area code 603 is not a city code. It covers 147 separate rate centres — billing areas, each its own local calling zone. The largest of them are named in the table below.
That matters twice over. A call between two 603 numbers is not necessarily a local call, because they can sit in different rate centres. And a code this wide narrows a subscriber to a region rather than a town.
603 is the only area code whose numbers sit mainly in New Hampshire. Every New Hampshire number therefore starts 603 unless it was issued in a border rate centre billed to a neighbouring code.
Where 603 numbers are concentrated
NANPA truncates rate-centre names to ten characters and drops the spaces, which is why W Lebanon is shortened. Names are reproduced as recorded rather than expanded — the abbreviation is the key the block data is filed under.
| Rate centre | Blocks | Share of 603 |
|---|---|---|
| Manchester | 525 | 9% |
| Nashua | 436 | 7% |
| Concord | 325 | 5% |
| Derry | 238 | 4% |
| Portsmouth | 216 | 4% |
| Dover | 208 | 3% |
| Merrimack | 190 | 3% |
| Keene | 165 | 3% |
| Laconia | 162 | 3% |
| Salem | 159 | 3% |
| Rochester | 128 | 2% |
| Exeter | 125 | 2% |
| Milford | 100 | 2% |
| Suncook | 94 | 2% |
| W Lebanon | 77 | 1% |
| Claremont | 75 | 1% |
| Lebanon | 67 | 1% |
| Plymouth | 67 | 1% |
| Bedford | 57 | 1% |
| Berlin | 55 | 1% |
| Hanover | 53 | 1% |
| No Conway | 52 | 1% |
| Littleton | 51 | 1% |
| Meredith | 51 | 1% |
123 further rate centres in 603 hold fewer blocks than these.
Carriers holding the most 603 blocks
Consolidated Comm Of No. New England787 blocks
Bell Atlantic Mobile, Inc (Verizon Wireless)520 blocks
Bell Atlantic Mobile, Inc393 blocks
AT&T Wireless372 blocks
Omnipoint Miami E License, Llc331 blocks
Comcast Ip Phone, Llc323 blocks
The largest holder, Consolidated Comm Of No. New England, has 13% of the code.
These are original allocations. A number keeps its digits and its block when its subscriber moves network, so a ported 603 number still reports the carrier it started with. Closing that gap needs a live query against the routing database. How line type is derived.
Check a single 603 number, or run a whole list through the free cleaner — neither uploads anything.
Common questions
Where is area code 603?
Area code 603 is centred on Manchester, New Hampshire and spans 147 rate centres, so it covers a region rather than a town.
Is a 603 number a mobile or a landline?
It can be either, and the digits do not say which. North American mobile and landline numbers share the same ranges, so the answer comes from the carrier holding the block. In 603 the split runs 40% mobile, 45% landline and 15% VoIP, so landline is the most likely single answer.
Which carriers hold 603 numbers?
The largest holders are Consolidated Comm Of No. New England, Bell Atlantic Mobile, Inc (Verizon Wireless), Bell Atlantic Mobile, Inc. That is the carrier the block was allocated to, which is not necessarily the network a given number sits on today.
How many 603 numbers are there?
The code holds 5,960 allocated blocks in our copy of the numbering plan. A block is 1,000 or 10,000 consecutive numbers depending on how deeply it has been pooled, so 603 covers on the order of 5,960,000 possible numbers — most of which have never been issued to anyone.