Northern Mariana Islands country code
+1 670 is the country code of Northern Mariana Islands. From the US, dial 1 670 234 5678; from a mobile phone, dial +1 670 234 5678.
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How to dial Northern Mariana Islands
Dial the exit code of the country you are calling from, then 1 without the plus sign, then the local number. Exit codes from ten large calling countries:
The example is a mobile number in Northern Mariana Islands, written locally as (670) 234-5678. There's no leading digit to leave out: dial the full local number after the country code.
Time in Northern Mariana Islands and the best time to call
Northern Mariana Islands is on UTC+10. Compared with New York its clock is +15 h, with London +10 h and with Dubai +6 h (today's offsets, daylight saving included).
Northern Mariana Islands does not change its clocks for daylight saving, so the offset stays UTC+10 all year.
Business hours in Northern Mariana Islands run 09:00–18:00 local time on working days. On other clocks that is:
The weekend in Northern Mariana Islands is Saturday and Sunday.
How numbers in Northern Mariana Islands are built
A number in Northern Mariana Islands is the country code +1 followed by a national number of 10 digits. The trunk prefix, where there is one, is dropped after the code.
Written locally as (670) 234-5678, an example mobile number in Northern Mariana Islands is dialed as +1 670 234 5678 from abroad.
To call out of Northern Mariana Islands, dial 011, then the other country's code and number. On a mobile phone you can type + instead of 011.
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Prices checked October 30, 2026.
Countries that share +1
Northern Mariana Islands shares +1 with the countries and territories below. The digits after the code, not the code itself, show which one a number belongs to. Numbers in the Northern Mariana Islands start with +1 670.
A call or message from +1 670 you don't recognize
The country code shows which country's numbering plan a number is registered in. It doesn't show who is calling, and caller IDs can be spoofed, so a +1 670 number isn't proof that the person is in Northern Mariana Islands.
- Don't call back an unfamiliar international number, especially after a single ring. A missed call that tempts you to return it is a known callback trap, and a call to a premium-rate number can cost far more than a normal one.
- Never share verification codes, passwords or card details with someone who contacts you unprompted, whichever country the number appears to be from.
- If calls or messages keep coming, block the number and report it through your mobile carrier.
- Most calls from Northern Mariana Islands are ordinary calls from family, friends, colleagues and businesses. If you are expecting one, save the number once the person has confirmed it.
Frequently asked questions
What is the country code for Northern Mariana Islands?
The country code for Northern Mariana Islands is +1 670. From abroad, dial your exit code (00 from most countries, 011 from the US and Canada), then +1 670 without the plus sign, then the local number. Written locally as (670) 234-5678, an example mobile number in Northern Mariana Islands is dialed as +1 670 234 5678 from abroad.
What's the exit code to dial Northern Mariana Islands from a mobile?
On a mobile phone you can skip exit codes altogether: type +1 670 and then the local number. From a landline, dial 011 from the US or Canada, 00 from the UK and most of Europe, or your own country's exit code first.
Do I need to drop the leading 0 when dialing Northern Mariana Islands?
No. Numbers in the Northern Mariana Islands have no leading digit to drop: dial +1, then the full local number.
What time is it in Northern Mariana Islands, and when is a good time to call?
Northern Mariana Islands is on UTC+10. Business hours there (09:00–18:00) are 23:00–08:00 UTC, 18:00–03:00 in New York and 23:00–08:00 in London.
How many digits is a phone number in Northern Mariana Islands?
A number in Northern Mariana Islands has 10 digits after the country code +1, not counting a leading trunk digit.
How much does it cost to call Northern Mariana Islands?
With QuikRing a call to Northern Mariana Islands costs $0.13/min to a mobile and $0.13/min to a landline, charged per started minute. You call from your browser, so there is no SIM card, roaming plan or app to set up.
Who is calling me from +1 670?
The code shows which country's numbering plan a number belongs to, not who is calling, and caller IDs can be spoofed. Don't call back an unknown number, block it if it keeps calling, and report it through your mobile carrier.
Which other countries use +1?
+1 is also used by American Samoa, Anguilla, Antigua & Barbuda, Bahamas, Barbados, Bermuda, British Virgin Islands, Canada, Cayman Islands, Dominica, Dominican Republic, Grenada, Guam, Jamaica, Montserrat, Puerto Rico, Sint Maarten, St. Kitts & Nevis, St. Lucia, St. Vincent & Grenadines, Trinidad & Tobago, Turks & Caicos Islands, U.S. Virgin Islands, and United States. The digits after the code show which one a number belongs to. Numbers in the Northern Mariana Islands start with +1 670.