Area codes › Caribbean & Atlantic
🇸🇽 721 area code
Area code 721 belongs to Sint Maarten. It is dialed like any US or Canadian number — 1 plus ten digits — but a call to it is an international call, billed at international rates. Enter a 721 number below for a free check before you call back.
- Location: Sint Maarten
- Time zone: Atlantic (UTC−4)
- In service since September 30, 2011
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Area code 721 at a glance
- Area code
- 721
- Location
- Sint Maarten
- Time zone
- Atlantic (UTC−4)
- Local time now
- —
- In service since
- September 30, 2011
- Local calls
- Dial 7 digits
- Number format
- (721) 555-0123
- From abroad
- +1 721 555 0123
721 and the one-ring scam
Because 721 looks like a US area code, it is a favourite of "one-ring" (wangiri) scams: the phone rings once, you call back, and the call is billed as international — sometimes with premium per-minute charges that go to the scammer.
If you do not know anyone in Sint Maarten, do not call back a missed 721 call. Look the number up first, and ask your carrier to block outgoing international calls if you never make them.
About area code 721
721 entered service on September 30, 2011.
よくある質問
Area code 721 questions
Sources: NANPA NPA database (11/04/2026) and Google libphonenumber. Area codes show where a number was assigned, not where its owner is today.
Where is area code 721?
Area code 721 is in Sint Maarten.
What time zone is area code 721?
721 is in the Atlantic (UTC−4) time zone, and does not observe daylight saving time.
When did area code 721 start?
721 entered service on September 30, 2011.
Is calling area code 721 international?
Yes. 721 is Sint Maarten, so calls from the US or Canada are billed as international even though you dial 1 + ten digits. Check your carrier's rates before calling back.
How do I find out who called me from 721?
Enter the full number in the lookup at the top of this page. The free check confirms whether the number is valid and shows its carrier, line type and region; a full report adds owner and public-web records where they are available.