Area codes · +1
Area code 224
Area code 224 is centred on Northbrook, Illinois. We hold 6,235 allocated blocks for it across 41 rate centres, split 52% mobile, 32% landline and 15% VoIP.
The other area codes laid over 224
Area code 224 does not have Northbrook to itself. 1 other code — 847 — 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.
8474,726 blocks, 46 rate centres, mostly landline
Each holds its own blocks and its own carrier mix, so a 224 number and a 847 number from the same street can report different line types. Filtering Northbrook by area code needs all 2 of them.
224 is not confined to Northbrook itself: its blocks sit across 41 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 224 is the largest of them, holding 9% of the Illinois total.
Where 224 numbers are concentrated
NANPA truncates rate-centre names to ten characters and drops the spaces, which is why Arligtnhts and Libertyvl 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 224 |
|---|---|---|
| Northbrook | 757 | 12% |
| Arligtnhts | 749 | 12% |
| Desplaines | 524 | 8% |
| Elgin | 476 | 8% |
| Waukegan | 413 | 7% |
| Algonquin | 391 | 6% |
| Deerfield | 190 | 3% |
| Barrington | 178 | 3% |
| Elk Grove | 178 | 3% |
| Wheeling | 163 | 3% |
| Glenview | 150 | 2% |
| Skokie | 142 | 2% |
| Palatine | 118 | 2% |
| Lakeforest | 116 | 2% |
| Roselle | 115 | 2% |
| Libertyvl | 112 | 2% |
| Round Lake | 109 | 2% |
| Evanston | 106 | 2% |
| Mundelein | 105 | 2% |
| Zion | 84 | 1% |
| Half Day | 83 | 1% |
| Antioch | 74 | 1% |
| Fox Lake | 73 | 1% |
| Huntley | 71 | 1% |
17 further rate centres in 224 hold fewer blocks than these.
Carriers holding the most 224 blocks
Onvoy917 blocks
T-Mobile Usa, Inc.888 blocks
AT&T Wireless885 blocks
Verizon Wireless877 blocks
T-Mobile USA, Inc.453 blocks
Bandwidth305 blocks
The largest holder, Onvoy, 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 224 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 224 number, or run a whole list through the free cleaner — neither uploads anything.
Common questions
Where is area code 224?
Area code 224 covers Northbrook, Illinois. It is not the only code there: 847 is an overlay on the same rate centres, so a Northbrook, Illinois number can start with any of them.
Is a 224 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 224 the split runs 52% mobile, 32% landline and 15% VoIP, so mobile is the most likely single answer.
Which carriers hold 224 numbers?
The largest holders are Onvoy, T-Mobile Usa, Inc., AT&T Wireless. That is the carrier the block was allocated to, which is not necessarily the network a given number sits on today.
How many 224 numbers are there?
The code holds 6,235 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 224 covers on the order of 6,235,000 possible numbers — most of which have never been issued to anyone.