Area codes · +1
Area code 730
Area code 730 is centred on Centralia, Illinois. We hold 985 allocated blocks for it across 64 rate centres, split 66% mobile, 14% landline and 19% VoIP.
The other area codes laid over 730
Area code 730 does not have Centralia to itself. 1 other code — 618 — 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.
6186,131 blocks, 242 rate centres, mostly mobile
Each holds its own blocks and its own carrier mix, so a 730 number and a 618 number from the same street can report different line types. Filtering Centralia by area code needs all 2 of them.
730 is not confined to Centralia itself: its blocks sit across 64 rate centres, named in the table below.
Illinois is split across 17 area codes — 224, 618, 708, 815, 217, 730 and others. By allocated blocks 730 is the 16th largest of them, holding 1% of the Illinois total.
Where 730 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 730 |
|---|---|---|
| Centralia | 156 | 16% |
| Herrin | 140 | 14% |
| Belleville | 131 | 13% |
| Olney | 117 | 12% |
| Carbondale | 99 | 10% |
| Collinsvl | 54 | 5% |
| Granite Cy | 22 | 2% |
| Alton | 19 | 2% |
| E St Louis | 15 | 2% |
| De Soto | 9 | 1% |
| Cairo | 8 | 1% |
| Goreville | 8 | 1% |
| Brookport | 7 | 1% |
| Iuka | 7 | 1% |
| Karnak | 7 | 1% |
| Benton | 6 | 1% |
| Kaskaskia | 6 | 1% |
| Mcclure | 6 | 1% |
| Mt Vernon | 6 | 1% |
| Murphysbo | 6 | 1% |
| O Fallon | 6 | 1% |
| Carlyle | 5 | 1% |
| Dix | 5 | 1% |
| Kell | 5 | 1% |
40 further rate centres in 730 hold fewer blocks than these.
Carriers holding the most 730 blocks
AT&T Wireless528 blocks
Teleport Communications America, Llc128 blocks
Onvoy99 blocks
Onvoy Spectrum48 blocks
Verizon Wireless28 blocks
Commio, Llc24 blocks
AT&T Wireless alone holds 54% of every block in 730, which is unusually concentrated for an area code.
These are original allocations. A number keeps its digits and its block when its subscriber moves network, so a ported 730 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 730 number, or run a whole list through the free cleaner — neither uploads anything.
Common questions
Where is area code 730?
Area code 730 covers Centralia, Illinois. It is not the only code there: 618 is an overlay on the same rate centres, so a Centralia, Illinois number can start with any of them.
Is a 730 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 730 the split runs 66% mobile, 14% landline and 19% VoIP, so mobile is the most likely single answer.
Which carriers hold 730 numbers?
The largest holders are AT&T Wireless, Teleport Communications America, Llc, Onvoy. That is the carrier the block was allocated to, which is not necessarily the network a given number sits on today.
How many 730 numbers are there?
The code holds 985 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 730 covers on the order of 985,000 possible numbers — most of which have never been issued to anyone.