Wisconsin area codes
Wisconsin uses 8 area codes. The oldest is 414, in service since 1947; the newest is 353, from 2023. Across them 3,681 of 6,288 possible number blocks are allocated, 58.5% of capacity. 608, 715 and 920 are at or past 95%, which is why new numbers there come from overlays rather than the original code. AT&T holds 28.3% of the 3,681 assigned blocks across the state, ahead of Verizon at 10.1%; a further 19.0% sits with CLEC and VoIP holders outside the national carriers. In the 33 days to 30 October 2026, FTC complaints named a Wisconsin caller ID 3,279 times – 1.4% of all complaints in the window, most often 414 with 677 (143rd of 422 nationally). NANPA records 701 rate centers across the state's codes, and local calls take all ten digits.
All 8 codes
| Code | In service | Blocks used | Largest holder | Complaints | Shares area with |
|---|---|---|---|---|---|
| 262 | 1999 | 634/786 | AT&T 39% | 675 | no overlay |
| 274 | 2023 | 29/786 | T-Mobile 37.9% | 10 | 920 |
| 353 | 2023 | 13/786 | Onvoy 76.9% | 41 | 608 |
| 414 | 1947 | 552/786 | AT&T 47.1% | 677 | no overlay |
| 534 | 2010 | 98/786 | Other CLEC / VoIP 33.7% | 98 | 715 |
| 608 | 1955 | 785/786 | Other CLEC / VoIP 28.3% | 498 | 353 |
| 715 | 1947 | 785/786 | Other CLEC / VoIP 21.4% | 604 | 534 |
| 920 | 1997 | 785/786 | AT&T 26.8% | 676 | 274 |
Block share is share of allocated number blocks, not of subscribers. Complaint counts cover 28 Sep – 30 Oct 2026 and reflect spoofed caller IDs as much as real calls.
How full Wisconsin’s codes are
A code holds at most 786 blocks of 10,000 numbers each. When a code fills up, the administrator does not reclaim numbers – it adds an overlay, and from then on new numbers in the same area come from the new code.
Full or nearly full
Who holds the number blocks
Counted from every assigned block in the state: 3,681 blocks, each with the holder NANPA recorded for it. Percentages are measured, not estimated.
| Holder | Blocks | Share of Wisconsin | Largest in |
|---|---|---|---|
| AT&T | 1,040 | 28.3% | 3 codes |
| Other CLEC / VoIP | 698 | 19% | 3 codes |
| Verizon | 370 | 10.1% | – |
| Lumen | 253 | 6.9% | – |
| T-Mobile | 252 | 6.8% | 1 code |
| Onvoy | 214 | 5.8% | 1 code |
| Brightspeed | 201 | 5.5% | – |
| Frontier | 195 | 5.3% | – |
| Charter | 154 | 4.2% | – |
| Windstream | 71 | 1.9% | – |
| TDS | 59 | 1.6% | – |
| American Messaging | 43 | 1.2% | – |
“Other CLEC / VoIP” is not one company: it is every holder outside the national carriers counted together, which is what resellers and app-based numbers look like in the records. This is allocation, not subscribers.
Spam complaints naming Wisconsin codes
FTC Do Not Call complaints where the caller ID shown was a Wisconsin number, 28 Sep – 30 Oct 2026 (33 days). Caller IDs on spam calls are routinely faked, so these are complaints about the code, not calls proven to come from it.
How Wisconsin got its codes
2 in the 1940s, 1 in the 1950s, 2 in the 1990s, 1 in the 2010s, 2 in the 2020s. Each code after the first was split off from or overlaid on one already in service.
- 1947 414 goes into service.
- 1947 715 goes into service.
- 1955 608 goes into service.
- 1997 920 goes into service, split from or overlaid on 414.
- 1999 262 goes into service, split from or overlaid on 414.
- 2010 534 goes into service, split from or overlaid on 715.
- 2023 274 goes into service, split from or overlaid on 920.
- 2023 353 goes into service, split from or overlaid on 608.
Time zones
Wisconsin is in Central time.
Frequently asked about Wisconsin area codes
How many area codes does Wisconsin have?
8 in service. They are 262, 274, 353, 414, 534, 608, 715 and 920.
What is the oldest area code in Wisconsin?
414, in service since 1947. Every later code in the state was split off from or overlaid on an existing one.
What is the newest area code in Wisconsin?
353, from 2023, overlaying 608.
Is Wisconsin running out of numbers?
608, 715 and 920 are at or past 95% of capacity, but NANPA has not opened relief planning for them, so no new code is announced.
What time zone is Wisconsin in?
Central time.
Which Wisconsin area code gets the most spam complaints?
414 – 677 FTC complaints in the 33 days to 30 October 2026, 143rd of 422 codes nationally. Those are complaints about the caller ID shown, and spam callers routinely fake a local-looking number, so this says the code is imitated often, not that the calls come from there.
Which carrier holds the most Wisconsin numbers?
AT&T, with 28.3% of the 3,681 blocks assigned across Wisconsin, ahead of Other CLEC / VoIP at 19.0%. This is allocation of blocks by the numbering administrator, not a count of subscribers – people keep their numbers when they switch carriers.
Do you have to dial 10 digits in Wisconsin?
Yes. Every code in the state is in an overlay or ten-digit dialing area, so a local call needs the area code too. Dialing seven digits reaches a recording, not a wrong number.
Sources and verification
- NANPA – NPA Database (npa_report.csv), file date 11/01/2026, retrieved Nov 1, 2026
- NANPA – CO Code Assignment Records, All States (utilized), file updated 11/01/2026, retrieved Nov 1, 2026
- FTC – Do Not Call Reported Calls Data, 28 Sep – 30 Oct 2026, retrieved Nov 1, 2026
Figures on this page are counted from those files, not copied from other sites. Spotted an error? Request a correction. How we collect and check: methodology.