Area codes in Oshkosh, Wisconsin
Oshkosh, Wisconsin uses 2 area codes — 920 and 274. The main Oshkosh area code is 920.
Area codes serving Oshkosh
Phone numbers in Oshkosh are written as ten digits — for example (920) 555-0190 — and fall in the Central Time zone.
How Oshkosh came to have 2 area codes
The original Oshkosh 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 Oshkosh 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 Oshkosh?
The main area code for Oshkosh, Wisconsin is 920. Oshkosh is now served by 2 area codes in total: 920, 274.
How many area codes does Oshkosh have?
Oshkosh has 2 area codes: 920, 274.
Why does Oshkosh have more than one area code?
As Oshkosh 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 Oshkosh 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.