Home phone number Sint Maarten
Sint Maarten Phone Number validator
How the phone number format works
- Format
- Sint Maarten phone number in national or international (+1) format
- Example
- +17215205678
Things to watch for
- Accepts national or international (E.164, e.g. +1...) format
- Validated with Google's libphonenumber; confirms the number is possible/valid for this country, not that it is currently assigned or reachable
^[+]?[0-9 ()\-]{6,}$A Sint Maarten phone number is a standard 10-digit NANP number — area code 721 plus a 7-digit local number — sharing the same +1 country code and shape as the US, Canada, and a long list of Caribbean nations. Sint Maarten is the Dutch half of an island split with French Saint-Martin, famous among travelers for Maho Beach, where jets on final approach to Princess Juliana International Airport pass low overhead just past the beach fence.
How this validator works
Enter the number in local form (721-520-5678) or full international form (+17215205678); this tool checks the digit count and confirms the area code matches 721, the code assigned to Sint Maarten only in 2011 when it became a separate country within the Kingdom of the Netherlands, using Google’s libphonenumber entirely client-side. Because NANP membership alone doesn’t distinguish territory of origin, that area-code check is what lets the validator confirm Sint Maarten specifically rather than just somewhere in the shared +1 plan.
What a pass doesn’t tell you
A pass confirms the number carries the genuinely Sint Maarten area code and a plausible local number — it doesn’t confirm the line is connected or the mobile SIM active.
Scope: format and area-code-origin validation only, for catching a mistyped digit before a number reaches a CRM or dialer — not a substitute for a carrier lookup.
Content last reviewed 2026-08-09.
phone number FAQ
Is Sint Maarten the same place as French Saint-Martin?
They share one small island split in two, but they're different countries — Sint Maarten is the Dutch side, a constituent country of the Kingdom of the Netherlands since 2010, while Saint-Martin is a French overseas collectivity with its own separate numbering under +590.
Why does Sint Maarten use a NANP area code instead of a Dutch-style code?
It joined the North American Numbering Plan relatively recently — area code 721 was only assigned in 2011, after Sint Maarten gained separate country status; before that, its numbers ran under the Netherlands Antilles' shared +599 code, the same one Curaçao still uses.
Does a valid 721 number confirm the SIM is currently active?
No. It only confirms the area code and 7-digit local number match a real Sint Maarten NANP pattern — not that the SIM is active or reachable, which needs a carrier-side lookup this tool doesn't perform.