920
Covers eastern Wisconsin
One of the original area codes of 1947
Split from area code 414
Overlay with 274
City facts
Green Bay area code
Area code for eastern Wisconsin: history, overlays and how to dial.
920
Green Bay uses area code 920. Because more than one area code serves the same area, local calls need all ten digits.
About area code 920
How to call a number in Green Bay
Inside the US
1 (920) 555-0123Dial 1, the area code, then the seven-digit number.Local call
(920) 555-0123Overlay area: always include the area code.From outside the US
+1 920 555 0123Use your country's exit code or +, then 1 for the US.Green Bay is on Central Time (CT); check the time before calling from another zone.
Green Bay quick facts
Green Bay was settled in 1764 and incorporated on February 27, 1854.
Settled1764
Incorporated1854February 27, 1854
CountyBrown CountyWisconsin
Area code920Population106,585Census ACS estimateZIP codes554301, 54302, 54303…Elevation581 ft177 m
Time zoneCentral TimeCT
Dates, namesake and elevation from Wikipedia: Green Bay, Wisconsin and Wikidata (checked 2026-11-08); population and ZIP codes from the U.S. Census Bureau.
Questions
What area code is Green Bay?
Green Bay uses area code 920. Because more than one area code serves the same area, local calls need all ten digits.
When did area code 920 start?
Area code 920 is one of the original North American area codes of 1947, when it was split from area code 414.
Do I need to dial the area code for local calls in Green Bay?
Yes. 920 share the same area as an overlay, so every local call needs the area code plus the seven-digit number (ten digits).
What time zone is area code 920 in?
Green Bay is on Central Time (CT).
Sources: Area codes 920 and 274 (Wikipedia) and Wikidata, checked 2026-11-08. Numbering plans change; the North American Numbering Plan Administrator is the official record.