Area codes in Janesville, Wisconsin
Janesville, Wisconsin uses 2 area codes — 608 and 353. The main Janesville area code is 608.
Area codes serving Janesville
Phone numbers in Janesville are written as ten digits — for example (608) 555-0190 — and fall in the Central Time zone.
How Janesville came to have 2 area codes
The original Janesville area code is 608, in service since 1955. As the area ran low on available numbers, an overlay code was added over the same region for new phone lines: 353 (2023). Existing numbers kept their original code — an overlay never forces anyone to change their number — which is why Janesville 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 Janesville?
The main area code for Janesville, Wisconsin is 608. Janesville is now served by 2 area codes in total: 608, 353.
How many area codes does Janesville have?
Janesville has 2 area codes: 608, 353.
Why does Janesville have more than one area code?
As Janesville used up the numbers available in its original area code (608, in service since 1955), additional "overlay" codes were added over the same area so new phone numbers could keep being assigned.
How do you dial a Janesville number?
Dial all 10 digits — the area code (608 or 353) 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.