Area codes · +1
Area code 630
Area code 630 is centred on Naperville, Illinois. We hold 5,043 allocated blocks for it across 33 rate centres, split 39% mobile, 55% landline and 6% VoIP.
The other area codes laid over 630
Area code 630 does not have Naperville to itself. 2 other codes — 331, 847 — serve the same rate centres, laid over the same ground rather than dividing it. That is an overlay: a new code added when the old one ran out of numbers, covering the same streets. Two neighbours can hold different area codes, so the code says roughly when a number was issued rather than where it sits.
Each holds its own blocks and its own carrier mix, so a 630 number and a 331 number from the same street can report different line types. Filtering Naperville by area code needs all 3 of them.
630 is not confined to Naperville itself: its blocks sit across 33 rate centres, named in the table below.
Illinois is split across 17 area codes — 224, 618, 708, 815, 217, 630 and others. By allocated blocks 630 is the 8th largest of them, holding 8% of the Illinois total.
Where 630 numbers are concentrated
NANPA truncates rate-centre names to ten characters and drops the spaces, which is why W Chicago and Bensenvl are 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 630 |
|---|---|---|
| Naperville | 505 | 10% |
| Hinsdale | 474 | 9% |
| Aurora | 404 | 8% |
| Downersgrv | 387 | 8% |
| Elmhurst | 362 | 7% |
| Roselle | 321 | 6% |
| Lombard | 261 | 5% |
| La Grange | 248 | 5% |
| Wheaton | 181 | 4% |
| Northbrook | 171 | 3% |
| W Chicago | 168 | 3% |
| Bensenvl | 166 | 3% |
| Lemont | 149 | 3% |
| Itasca | 145 | 3% |
| Geneva | 133 | 3% |
| St Charles | 127 | 3% |
| Batavia | 120 | 2% |
| Glen Ellyn | 103 | 2% |
| Sugargrove | 101 | 2% |
| Bartlett | 95 | 2% |
| Warrenvl | 79 | 2% |
| Big Rock | 65 | 1% |
| Oswego | 55 | 1% |
| Yorkville | 45 | 1% |
9 further rate centres in 630 hold fewer blocks than these.
Carriers holding the most 630 blocks
Illinois Bell813 blocks
T-Mobile Usa, Inc.524 blocks
T-Mobile USA, Inc.488 blocks
Verizon Wireless467 blocks
AT&T Wireless344 blocks
Onvoy251 blocks
The largest holder, Illinois Bell, has 16% of the code.
These are original allocations. A number keeps its digits and its block when its subscriber moves network, so a ported 630 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 630 number, or run a whole list through the free cleaner — neither uploads anything.
Common questions
Where is area code 630?
Area code 630 covers Naperville, Illinois. It is not the only code there: 331, 847 are overlays on the same rate centres, so a Naperville, Illinois number can start with any of them.
Is a 630 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 630 the split runs 39% mobile, 55% landline and 6% VoIP, so landline is the most likely single answer.
Which carriers hold 630 numbers?
The largest holders are Illinois Bell, T-Mobile Usa, Inc., T-Mobile USA, Inc.. That is the carrier the block was allocated to, which is not necessarily the network a given number sits on today.
How many 630 numbers are there?
The code holds 5,043 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 630 covers on the order of 5,043,000 possible numbers — most of which have never been issued to anyone.