Area codes · +1
Area code 618
Area code 618 is centred on Collinsville, Illinois. We hold 6,131 allocated blocks for it across 242 rate centres, split 43% mobile, 42% landline and 15% VoIP.
The other area codes laid over 618
Area code 618 does not have Collinsville, Illinois to itself. 1 other code — 730 — serves 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.
730985 blocks, 64 rate centres, mostly mobile
Each holds its own blocks and its own carrier mix, so a 618 number and a 730 number from the same street can report different line types. Filtering Collinsville, Illinois by area code needs all 2 of them.
618 is not confined to Collinsville, Illinois itself: its blocks sit across 242 rate centres, named in the table below.
Illinois is split across 17 area codes — 224, 618, 708, 815, 217, 309 and others. By allocated blocks 618 is the second largest of them, holding 9% of the Illinois total.
Where 618 numbers are concentrated
NANPA truncates rate-centre names to ten characters and drops the spaces, which is why Collinsvl and Granite Cy 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 618 |
|---|---|---|
| Collinsvl | 628 | 10% |
| Belleville | 240 | 4% |
| Carbondale | 230 | 4% |
| Granite Cy | 192 | 3% |
| Centralia | 174 | 3% |
| Olney | 146 | 2% |
| Alton | 125 | 2% |
| Herrin | 122 | 2% |
| Mt Vernon | 120 | 2% |
| Marion | 118 | 2% |
| Edwardsvl | 100 | 2% |
| E St Louis | 91 | 1% |
| Benton | 89 | 1% |
| Wood River | 86 | 1% |
| Harrisburg | 77 | 1% |
| Metropolis | 68 | 1% |
| O Fallon | 68 | 1% |
| Jerseyvl | 64 | 1% |
| Edgemont | 59 | 1% |
| Anna | 56 | 1% |
| Vandalia | 52 | 1% |
| Mt Carmel | 46 | 1% |
| Robinson | 46 | 1% |
| Glencarbon | 44 | 1% |
218 further rate centres in 618 hold fewer blocks than these.
Carriers holding the most 618 blocks
AT&T Wireless927 blocks
Onvoy885 blocks
Illinois Bell443 blocks
Frontier North, Inc.439 blocks
Verizon Wireless433 blocks
T-Mobile USA, Inc.312 blocks
The largest holder, AT&T Wireless, has 15% of the code.
These are original allocations. A number keeps its digits and its block when its subscriber moves network, so a ported 618 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 618 number, or run a whole list through the free cleaner — neither uploads anything.
Common questions
Where is area code 618?
Area code 618 covers Collinsville, Illinois. It is not the only code there: 730 is an overlay on the same rate centres, so a Collinsville, Illinois number can start with any of them.
Is a 618 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 618 the split runs 43% mobile, 42% landline and 15% VoIP, so mobile is the most likely single answer.
Which carriers hold 618 numbers?
The largest holders are AT&T Wireless, Onvoy, Illinois Bell. That is the carrier the block was allocated to, which is not necessarily the network a given number sits on today.
How many 618 numbers are there?
The code holds 6,131 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 618 covers on the order of 6,131,000 possible numbers — most of which have never been issued to anyone.