Area code 353 – Wisconsin
353 has served Wisconsin since 2023, split from 608. It is still largely empty: 13 of 786 number blocks allocated. Onvoy / Inteliquent holds 76.9% of those blocks, which is unusually concentrated for a US area code. It shares its geography with overlay codes 608, so local calls take all ten digits. Spam complaints are comparatively rare: 41 in the 33 days to 30 October 2026, 389th of the 422 codes with five or more complaints.
Who holds 353 number blocks
Share of the 13 assigned NXX blocks (1.7% of the 786 possible), across 4 carriers. This is share of number blocks, not of subscribers.
- Onvoy76.9%
- Other CLEC / VoIP15.4%
- T-Mobile7.7%
Spam complaints naming 353
FTC Do Not Call complaints where the caller ID was a 353 number, 28 Sep – 30 Oct 2026 (33 days). Caller IDs on spam calls are frequently spoofed, so these are complaints about the code, not calls proven to originate in it.
Rate centers in 353
NANPA allocates number blocks to rate centers and records their names abbreviated to ten characters, so these are NANPA's codes rather than place names – CHAMPAURBN is Champaign-Urbana, NWYRCYZN01 is a New York City zone. We show them unchanged instead of guessing at the full names. Showing the largest 5 of 11.
Timeline
- 2023 353 goes into service, split from or overlaid on 608.
More about 353
Separate pages for the questions that need their own answer: what time it is there, what the complaint data says, who holds the number blocks, and how the code compares with the one it shares its area with.
Frequently asked about 353
What state is area code 353?
Wisconsin. It covers the same area as 353/608.
Is a call from 353 a scam?
Not by itself. 353 drew 41 FTC complaints in the 33 days to 30 October 2026, 389th of 422 ranked codes – mid-pack or lower. Spam callers spoof caller IDs, so the only useful check is the full number.
Which carrier owns 353 numbers?
Onvoy / Inteliquent holds the largest share of assigned number blocks at 76.9%. The rest is spread across 2 other carriers. This is share of number blocks, not of subscribers – people keep their numbers when they switch carriers.
Do I need to dial 10 digits in 353?
Yes – ten digits for local calls in 353, because it shares its area with another code.
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, 25 daily files 28 Sep – 30 Oct 2026, retrieved Nov 1, 2026
NANPA dialing note for this code: “10D”. Reviewed by the data desk. Spotted an error? Request a correction.