Area codes in Green Bay, Wisconsin
Green Bay, Wisconsin uses 2 area codes — 920 and 274. The main Green Bay area code is 920.
Area codes serving Green Bay
Phone numbers in Green Bay are written as ten digits — for example (920) 555-0190 — and fall in the Central Time zone.
How Green Bay came to have 2 area codes
The original Green Bay area code is 920, in service since 1997. As the area ran low on available numbers, an overlay code was added over the same region for new phone lines: 274 (2023). Existing numbers kept their original code — an overlay never forces anyone to change their number — which is why Green Bay now uses all 2 codes and every local call is dialed with ten digits.
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Frequently asked questions
What is the area code for Green Bay?
The main area code for Green Bay, Wisconsin is 920. Green Bay is now served by 2 area codes in total: 920, 274.
How many area codes does Green Bay have?
Green Bay has 2 area codes: 920, 274.
Why does Green Bay have more than one area code?
As Green Bay used up the numbers available in its original area code (920, in service since 1997), additional "overlay" codes were added over the same area so new phone numbers could keep being assigned.
How do you dial a Green Bay number?
Dial all 10 digits — the area code (920 or 274) followed by the 7-digit local number. From abroad, dial +1, then the area code and number.
Sourced from the official NANPA (North American Numbering Plan Administrator) numbering database, current as of August 2, 2026. Refreshed monthly.