577 area code — NANP AREA non-geographic

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

Area code 577 is a non-geographic code serving NANP AREA in the Eastern time zone. It has been in service since March 27, 2014. The same territory is also served by its overlay codes (500/521/522/523/524/525/526/527/528/529/532/533/538/542/544/566/577/588 complex). Keep in mind the code identifies where the number was registered; the person calling may be elsewhere.

The code was carved out of 500 (2014).

577 is a non-geographic service code (Non-Geographic Services): it is not tied to any state or rate center, and its numbers are assigned under service-specific rules rather than the geographic central-office process. Public prefix tables therefore do not apply to this code.

Practical takeaway: the 577 label narrows geography, the prefix narrows it to a locality, and neither authenticates a caller. Verification means calling back through a number you found yourself.

FAQ

Why do 500 and 577 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 500/521/522/523/524/525/526/527/528/529/532/533/538/542/544/566/577/588 complex shares one service area, and local calls are dialed with 10 digits.

Why am I getting spam calls from 577 numbers?

Scammers spoof real area codes so calls look legitimate. A displayed 577 number does not prove the call originated there — see our guide to spotting spoofed calls.

Where is a 577 number from?

577 is assigned to NANP AREA in the Eastern time zone. The three digits after the area code (the prefix) narrow it down to a rate center.