North American Numbers Source-cited · ownership disclosed
Area code
920
In service
United States · since 1997

Green Bay / Fox Cities

Serves eastern Wisconsin including Green Bay, the Fox Cities, Oshkosh, Fond du Lac, Manitowoc, and Sheboygan. Split from 414 in 1997 and overlaid by 274 in 2023.

The essentials Numbering data · NumberResearch · as of 2026-09-18
Place
Green Bay / Fox Cities
Type
geographic
Status
in service
In service since
1997
Projected exhaust
2059 Q2

Status, dates and counts are read from NumberResearch (NANPA / CNAC / FCC records). Assignment records show initial assignees, not the carrier serving a number today.

A · Where it is

Where 920 is

Eastern Wisconsin — 18 counties including Brown, Calumet, Door, Fond du Lac, Kewaunee, Manitowoc, Outagamie, Sheboygan and Winnebago..

Communities served wholly or partly by 920:

Green BayAppletonOshkoshNeenahMenashaFond du LacSheboyganManitowoc
B · Relationships

How it relates to other codes

The codes 920 was split from, spawned, or shares its area with. A split divides the map and changes some numbers; an overlay shares the same ground and changes none — what's the difference?

Split from · 1997 414 Milwaukee Split from 414 on July 26, 1997.
Overlay · 2023 274 Green Bay / Fox Cities (overlay) All-services overlay covering the identical 920 geography, in service May 5, 2023.
What's changing. Overlaid by 274 since May 5, 2023 (ten-digit dialing required).
C · History

How 920 got here

1997-07-26
Established via split from area code 414 for eastern Wisconsin.
Source: Wikipedia
2021-10-24
Mandatory ten-digit dialing began due to the nationwide 988 designation.
Source: Wikipedia
2023-05-05
Overlay area code 274 activated over the 920 area.
Source: Wikipedia
D · Capacity

How full it is

Prefixes assigned
799
Prefixes available
1
Thousands-blocks assigned
3,581

Prefix-assignment counts describe allocation to carriers, not how many individual numbers are in use. Full technical records: NumberResearch ↗.

Compare 920 with another code →
Sources
Wikipedia ↗
Area code 920
NumberResearch.org ↗
Live status, dates, assignment counts and exhaust forecast — data as of 2026-09-18 (CC BY 4.0).

Place, relationships and history above are compiled by North American Numbers from the sources listed and last checked 2026-09-18. A check date is not an expert review — see how this is made. Flag an error.