Area codes · +1
Area code 779
Area code 779 is centred on Rockford, Illinois. We hold 2,970 allocated blocks for it across 139 rate centres, split 45% mobile, 27% landline and 28% VoIP.
The other area codes laid over 779
Area code 779 does not have Rockford to itself. 1 other code — 815 — 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.
8155,718 blocks, 200 rate centres, mostly landline
Each holds its own blocks and its own carrier mix, so a 779 number and a 815 number from the same street can report different line types. Filtering Rockford by area code needs all 2 of them.
779 is not confined to Rockford itself: its blocks sit across 139 rate centres, named in the table below.
Illinois is split across 17 area codes — 224, 618, 708, 815, 217, 779 and others. By allocated blocks 779 is the 11th largest of them, holding 4% of the Illinois total.
Where 779 numbers are concentrated
NANPA truncates rate-centre names to ten characters and drops the spaces, which is why Crystal Lk 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 779 |
|---|---|---|
| Rockford | 380 | 13% |
| Joliet | 275 | 9% |
| Momence | 209 | 7% |
| De Kalb | 151 | 5% |
| Freeport | 124 | 4% |
| Kankakee | 97 | 3% |
| Woodstock | 89 | 3% |
| Frankfort | 79 | 3% |
| Mchenry | 60 | 2% |
| Plainfield | 60 | 2% |
| Crystal Lk | 47 | 2% |
| Sterling | 44 | 1% |
| So Beloit | 42 | 1% |
| La Salle | 40 | 1% |
| Sandwich | 33 | 1% |
| Wilmington | 33 | 1% |
| Dwight | 32 | 1% |
| Galena | 32 | 1% |
| Streator | 32 | 1% |
| Sycamore | 31 | 1% |
| Braidwood | 27 | 1% |
| Marengo | 26 | 1% |
| Belvidere | 25 | 1% |
| Dixon | 25 | 1% |
115 further rate centres in 779 hold fewer blocks than these.
Carriers holding the most 779 blocks
Onvoy644 blocks
AT&T Wireless445 blocks
Verizon Wireless218 blocks
United States Cellular171 blocks
T-Mobile USA, Inc.170 blocks
Onvoy Spectrum140 blocks
The largest holder, Onvoy, has 22% of the code.
These are original allocations. A number keeps its digits and its block when its subscriber moves network, so a ported 779 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 779 number, or run a whole list through the free cleaner — neither uploads anything.
Common questions
Where is area code 779?
Area code 779 covers Rockford, Illinois. It is not the only code there: 815 is an overlay on the same rate centres, so a Rockford, Illinois number can start with any of them.
Is a 779 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 779 the split runs 45% mobile, 27% landline and 28% VoIP, so mobile is the most likely single answer.
Which carriers hold 779 numbers?
The largest holders are Onvoy, AT&T Wireless, Verizon Wireless. That is the carrier the block was allocated to, which is not necessarily the network a given number sits on today.
How many 779 numbers are there?
The code holds 2,970 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 779 covers on the order of 2,970,000 possible numbers — most of which have never been issued to anyone.