Green Bay, Appleton, Oshkosh, and Sheboygan anchor the 920 area code, covering roughly 21 counties across northeastern Wisconsin. It's been in service since July 26, 1997, when it split off from 414 — and in 2023, an overlay, 274, joined the same footprint as manufacturing and population growth pushed 920 toward exhaustion.
This guide covers 920's counties and cities, where its boundaries stop, the split-then-overlay history that shaped today's footprint, which features are worth adding to a 920 line, and whether 920 calls ever get flagged as spam.
Counties and cities at a glance
| City | County | Region |
|---|---|---|
| Green Bay | Brown | Northern Fox Valley |
| Appleton | Outagamie | Central Fox Valley |
| Oshkosh | Winnebago | Southern Fox Valley |
| Sheboygan | Sheboygan | Lakeshore |
| Manitowoc | Manitowoc | Lakeshore |
| Fond du Lac | Fond du Lac | Southern edge |
What 920 does NOT cover
Milwaukee and southeastern Wisconsin, which kept 414 in the 1997 split, sit just south of 920's boundary. Madison and south-central Wisconsin use 608, while northwestern Wisconsin runs on 715. 920 covers only the northeastern lakeshore and Fox Valley corridor between those regions.
From a 1997 split to a 2023 overlay
July 26, 1997 — 920 split off from 414, taking the northeastern third of Wisconsin while Milwaukee and the southeast kept 414.
May 5, 2023 — 274 launched as an all-services overlay on the same 920 footprint, once manufacturing and residential growth pushed the region toward exhaustion. Mandatory ten-digit dialing had already begun on October 24, 2021, ahead of the overlay.
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Features worth adding on a 920 number
Northeastern Wisconsin's economy — paper manufacturing in the Fox Valley, the Green Bay Packers' year-round pull on Lambeau Field business, and specialty manufacturers like Oshkosh Corporation — keeps adding new commercial lines every year.
A hosted 920 or 274 line pairs well with call routing across multiple shop-floor or office extensions, an auto-attendant for after-hours calls, and call analytics for tracking response times. Most providers bundle these into a flat monthly plan rather than pricing each feature separately.
Many of these Fox Valley businesses are moving their phone systems onto UCaaS (Unified Communications as a Service) — one cloud platform for calling, video, and messaging that scales as a company adds locations across the region, the same pattern behind newer overlays like 919 in North Carolina's Research Triangle. Contact us to set up a 920 or 274 number for your Wisconsin business.
Is 920 ever flagged as a spam area code?
Because 920 covers a well-known, mid-sized metro cluster, it isn't singled out in spam-call databases any more than most area codes its size. Occasional robocall spoofing happens everywhere, but there's no unusual pattern tying spam specifically to 920. Treat an unexpected 920 call the way you would any unfamiliar number, and verify before sharing personal information.
Time zone & how to dial a 920 number
Northeastern Wisconsin runs on Central Time (CT) — CST (UTC −6) in winter, CDT (UTC −5) during Daylight Saving Time. Ten-digit dialing has been mandatory since October 24, 2021: dial 1, then the area code, then the seven-digit number, for every local call.
Key takeaways
- 920 covers northeastern Wisconsin — Green Bay, Appleton, and Oshkosh — since splitting from 414 in 1997.
- The 274 overlay joined the same territory on May 5, 2023.
- Anchors include paper manufacturing, the Green Bay Packers, and Oshkosh Corporation.
- Both 920 and 274 cover identical territory at identical rates.
- Time zone: Central (CT), with mandatory 10-digit dialing since October 2021.
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Frequently asked questions
What is the 920 area code?
It covers northeastern Wisconsin, including Green Bay, Appleton, and Oshkosh, and has been active since 1997.
Where is the 920 area code located?
Roughly 21 counties across northeastern Wisconsin's Fox Valley and Lakeshore regions.
Is 920 a Florida area code?
No. It has never been assigned to Florida — this is strictly a Wisconsin code.
What state is the 920 area code in?
Wisconsin — specifically the northeastern part of the state, anchored by Green Bay.
What time zone is the 920 area code?
Central Time Zone (CT) — CST (UTC −6) in winter and CDT (UTC −5) during Daylight Saving Time.
Why does the Fox Valley have two area codes, 920 and 274?
274 was added in 2023 as an overlay after regulators determined 920 would run short on numbers due to manufacturing and population growth.
How do I get a 920 area code number?
Sign up with a VoIP provider such as My Country Mobile, search for available numbers in either code, choose a Fox Valley prefix, select a plan, and activate.
