Area codes · +1
Area code 608
Area code 608 is centred on Madison, Wisconsin. We hold 5,751 allocated blocks for it across 159 rate centres, split 46% mobile, 40% landline and 14% VoIP.
The other area codes laid over 608
Area code 608 does not have Madison to itself. 1 other code — 353 — 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.
35374 blocks, 11 rate centres, mostly VoIP
Each holds its own blocks and its own carrier mix, so a 608 number and a 353 number from the same street can report different line types. Filtering Madison by area code needs all 2 of them.
608 is not confined to Madison itself: its blocks sit across 159 rate centres, named in the table below.
Wisconsin is split across 8 area codes — 920, 608, 715, 262, 414, 534 and others. By allocated blocks 608 is the second largest of them, holding 21% of the Wisconsin total.
Where 608 numbers are concentrated
NANPA truncates rate-centre names to ten characters and drops the spaces, which is why Richld Ctr and Plattevl 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 608 |
|---|---|---|
| Madison | 1,508 | 26% |
| Janesville | 349 | 6% |
| La Crosse | 267 | 5% |
| Beloit | 224 | 4% |
| Stoughton | 128 | 2% |
| Baraboo | 102 | 2% |
| Portage | 81 | 1% |
| Tomah | 79 | 1% |
| Wiscondlls | 74 | 1% |
| Dodgeville | 73 | 1% |
| Monroe | 68 | 1% |
| Middleton | 66 | 1% |
| Mauston | 63 | 1% |
| Richld Ctr | 59 | 1% |
| Reedsburg | 56 | 1% |
| Plattevl | 54 | 1% |
| Verona | 53 | 1% |
| Edgerton | 52 | 1% |
| Adams | 50 | 1% |
| Evansville | 49 | 1% |
| Sauk City | 48 | 1% |
| Sparta | 44 | 1% |
| Sunprairie | 43 | 1% |
| Mcfarland | 40 | 1% |
135 further rate centres in 608 hold fewer blocks than these.
Carriers holding the most 608 blocks
Onvoy745 blocks
United States Cellular553 blocks
Verizon Wireless510 blocks
AT&T Wireless363 blocks
Bandwidth218 blocks
Frontier North Inc.194 blocks
The largest holder, Onvoy, has 13% of the code.
These are original allocations. A number keeps its digits and its block when its subscriber moves network, so a ported 608 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 608 number, or run a whole list through the free cleaner — neither uploads anything.
Common questions
Where is area code 608?
Area code 608 covers Madison, Wisconsin. It is not the only code there: 353 is an overlay on the same rate centres, so a Madison, Wisconsin number can start with any of them.
Is a 608 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 608 the split runs 46% mobile, 40% landline and 14% VoIP, so mobile is the most likely single answer.
Which carriers hold 608 numbers?
The largest holders are Onvoy, United States Cellular, 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 608 numbers are there?
The code holds 5,751 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 608 covers on the order of 5,751,000 possible numbers — most of which have never been issued to anyone.