Area code 721: where it is and who calls from it
Area code 721 is in Sint Maarten (outside the U.S.).
Sint Maarten (all)
721 is not a U.S. or Canadian area code. Sint Maarten uses North American-style numbers, so they look domestic, but calling one back can be charged as an international call. A common scam rings once and hangs up so you'll call back. If you don't know anyone in Sint Maarten, don't return the call. FCC: one-ring scams.
| Where | Sint Maarten |
|---|---|
| Time zone | Atlantic Time ยท local time |
| In service since | 2011 |
| Overlay | No |
Got a call from 721?
A call from 721 is a call from Sint Maarten, not from the U.S. or Canada. If you don't know anyone there, don't call back, especially after a missed call that rang once. Read about one-ring calls.
Area code facts from the NANPA area code database (updated 10/06/2026); prefixes and carriers from NANPA's central office code records (updated 2026-10-10). Place description adapted from Wikipedia, CC BY-SA 4.0.