336 area code — Greensboro, NC geographic

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

336 is the area code for Greensboro, North Carolina, in service since December 15, 1997, Eastern time. Together with 743 it forms the 336/743 overlay. Because of number portability and VoIP, the area code tells you where the number was issued, not where the caller is right now.

NANPA lists 782 active NXX prefixes in 336, assigned to 49 carriers. 535 of those prefixes are pooled — shared between carriers in thousands-number blocks. The code spans 88 rate centers (billing localities).

To check where a specific 336 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.

The dialing plan is 10D for home-NPA local calls and 10D across codes.

Official projections put exhaust for the 336/743 complex at 2Q 2071.

Its parent code is 910, which it left in 1997. Later relief produced 743 (2016) from its territory.

Largest localities in 336

FAQ

Why do 743 and 336 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 336/743 complex shares one service area, and local calls are dialed with 10 digits.

Will 336 run out of numbers?

NANPA's current forecast projects exhaust in 2Q 2071 — decades of capacity remain.

Why am I getting spam calls from 336 numbers?

Scammers spoof recognizable area codes so calls look local or familiar. A displayed 336 number does not prove the call originated there — see our guide to spotting spoofed calls.

Where is a 336 number from?

336 is assigned to Greensboro and surrounding areas of North Carolina in the Eastern time zone. The three digits after the area code (the prefix) narrow it down to a rate center.