608 area code — Madison, WI geographic

Data: NANPA public reports, current as of July 28, 2026.

The 608 area code covers Madison, Wisconsin, Central time zone, and dates back to January 1, 1955. The same territory is also served by its overlay code (353/608 complex). Keep in mind the code identifies where the number was registered; the person calling may be elsewhere.

The code currently holds 785 working prefixes, held by 74 different carriers. Of these, 588 are pooled prefixes shared by multiple carriers. Numbers are anchored to 159 rate centers — billing localities that fix where each prefix belongs.

The current NANPA exhaust forecast for the 353/608 complex is 1Q 2065.

Local calls inside 608 are dialed 10D; 1+10 digit dialing permissible at service provider discretion..

To check where a specific 608 number was issued, look up its six-digit prefix; to check who is actually calling, ignore the display and verify through an official callback number — caller ID is assertable and routinely spoofed.

As demand grew it in turn gave rise to 353 (2023).

Largest localities in 608

FAQ

Why do 353 and 608 cover the same place?

They are overlays: when a code runs low on numbers, a new code is added over the same territory instead of splitting it. The 353/608 complex shares one service area, and local calls are dialed with 10 digits.

Will 608 run out of numbers?

NANPA's current forecast projects exhaust in 1Q 2065 — decades of capacity remain.

Why am I getting spam calls from 608 numbers?

Scammers spoof recognizable area codes so calls look local or familiar. A displayed 608 number does not prove the call originated there — see our guide to spotting spoofed calls.

Where is a 608 number from?

608 is assigned to Madison and surrounding areas of Wisconsin in the Central time zone. The three digits after the area code (the prefix) narrow it down to a rate center.