Northern Mariana Islands country code +1 670 — call Northern Mariana Islands & get a number.
The Northern Mariana Islands country code is **+1 with area code 670** — it's NOT a separate international code. The CNMI is a US Commonwealth in the North American Numbering Plan (NANP), so a Saipan number is dialed exactly like a US number: 1 + 670 + 7 digits. From the US you never dial 011. The trickier part is the time zone — Chamorro Standard Time (UTC+10, no DST) puts the islands nearly a day ahead of the American mainland.
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Northern Mariana Islands at a glance
The numbers and facts you need before you dial.
What is the country code for Northern Mariana Islands?
The country code for the Northern Mariana Islands is +1, the same code used across the United States, Canada, and much of the Caribbean. Within that shared +1 space, the Commonwealth of the Northern Mariana Islands (CNMI) is identified by the area code 670.
This is the single most important thing to understand about the Northern Mariana Islands country code: it is *not* a distinct national code like +49 for Germany or +223 for Mali. Because the CNMI is a US Commonwealth, it's a full member of the North American Numbering Plan (NANP). A number in Saipan looks and behaves exactly like a number in Los Angeles or Chicago — a 10-digit string beginning with the 670 area code.
It works the same way as its Pacific neighbour Guam (+1 671), as well as Puerto Rico, the US Virgin Islands, and American Samoa (+1 684): all are US territories that share the +1 country code and are distinguished only by their area code. So when someone gives you a "670 number," treat it as a domestic US number rather than an international one.
All four mean the same thing — they connect your call to Northern Mariana Islands.
How to call Northern Mariana Islands from anywhere
Because 670 is a NANP area code, the dialing steps depend on whether you are already inside the +1 zone. From the US or Canada: 1-670-XXX-XXXX (identical to calling another US state — no international prefix). From the UK or EU: 00 1 670 XXX XXXX. From any mobile: +1 670 XXX XXXX (the + prefix inserts the correct exit code automatically). From Australia: 0011 1 670 XXX XXXX. The pattern never changes once you reach +1: country code 1 → area code 670 → 7-digit local number.
Full example: +1 670 670 XXX XXXX — drop the local leading 0 when calling from abroad.
Northern Mariana Islands phone number format explained
Northern Mariana Islands numbers are standard 10-digit NANP numbers: +1 670 XXX XXXX. Written internationally: +1 670 234 5678. Dialed domestically (from the US or CNMI): 1 670 234 5678, or often just 670 234 5678 for local calls. The 011 exit code only matters when you're calling *out of* the CNMI to a genuinely foreign country — you never use 011 to reach a 670 number from inside the US.
Landline
Landlines and mobiles share the single 670 area code — there's no landline-specific prefix. Both use the standard 10-digit NANP format.
Mobile
Mobiles use the same 670 area code as landlines — there's no separate mobile prefix. The two main carriers (IT&E and Docomo Pacific) both operate across neighbouring Guam as well, so many US-based mobile plans cover the CNMI at domestic rates.
Northern Mariana Islands area codes — major cities
Drop the local leading 0 when calling from abroad.
| City | Region | Area code |
|---|---|---|
| Saipan (capital, largest island) | Saipan | 670 |
| Tinian | Tinian | 670 |
| Rota | Rota | 670 |
Northern Mariana Islands mobile network prefixes
The prefix after +1 670 tells you which network issued the SIM — though number portability means it no longer guarantees the operator.
IT&E
one of the two main carriers serving the CNMI and neighbouring Guam.
Docomo Pacific
the second main carrier across the CNMI and Guam.
Northern Mariana Islands time zone
The Northern Mariana Islands observe Chamorro Standard Time (ChST), UTC+10, and the islands do not observe daylight saving time. That single fact makes the CNMI one of the trickiest US-affiliated places to schedule calls with, because it sits far ahead of the American mainland and effectively a day ahead for much of the day. When it's 6:00 PM Monday in New York (EDT), it's 9:00 AM Tuesday in Saipan — a 14-hour difference and already the next calendar day. When it's 9:00 AM Monday in Los Angeles (PDT), it's 3:00 AM Tuesday in Saipan. Because the CNMI never shifts for DST, the gap with US mainland cities narrows by an hour during US summer time and widens again in winter — always confirm the current offset before booking a live call.
From US Eastern, dial evening slots (7:00–9:00 PM ET) to reach Saipan next-morning 9:00–11:00 AM. From US Pacific, dial late-afternoon (4:00–6:00 PM PT) to reach next-morning Saipan. From the UK, morning UK hours (11:00 AM–1:00 PM BST) reach Saipan late afternoon (7:00–9:00 PM ChST). Confirm the calendar DAY, not just the hour — this is the trans-Pacific mistake that eats meeting slots.
Emergency numbers in Northern Mariana Islands
Free to call from any Northern Mariana Islands phone, landline or mobile.
Common mistakes when calling Northern Mariana Islands
Almost every failed international call is a formatting issue, not a network issue.
Treating 670 as an international call from the US
It isn't. You do NOT need 011 or any exit code from the US — just dial 1-670-XXX-XXXX like any US number. Many US mobile plans include the CNMI in domestic coverage.
Adding 011 from inside the US
The 011 exit code is only for calling OUT of the CNMI/US to genuinely foreign countries. It does nothing when reaching a 670 number domestically.
Getting the +10h day-ahead time wrong
Saipan is UTC+10 with no DST — hours ahead of the Americas and usually on the NEXT calendar day. A "10 AM their time" call scheduled without checking often lands in the middle of the night on one side. Confirm the calendar day, not just the hour.
Assuming a separate mobile prefix
Mobiles and landlines share the single 670 area code — there's no mobile-only prefix. Both are dialed +1 670 XXX XXXX.
Confusing 670 with Guam's 671
The Northern Marianas (670) and Guam (671) are Pacific neighbours in the same time zone, but they're distinct US territories with distinct area codes.
Tips to reduce the cost of calling Northern Mariana Islands
Check if your US plan already includes 670
Many domestic US mobile plans cover the CNMI as a US territory at no extra charge — no international rate to worry about.
Use a +1 670 VoIP or virtual number for local presence
A 670 number lets your business give island customers a familiar local caller ID, and calls route over the internet at domestic rates.
Batch calls to fit the ChST window
Coordinate around the CNMI 8 AM–5 PM working day so you're not paying for repeated attempts or hitting off-hours voicemail.
Prefer app-to-app or SIP calling
For international callers outside the +1 zone, VoIP avoids per-minute long-distance charges and keeps quality consistent across the long Pacific hop.
Why businesses get a Northern Mariana Islands virtual number
A local 670 number gives your business a genuine Northern Mariana Islands presence without a physical office on Saipan. Island customers recognize and trust a familiar local number, are more likely to answer, and can reach you at local-call rates. For companies serving the CNMI, Guam, and the wider Micronesia market, a 670 number signals commitment to the region while your team works from anywhere. It also keeps inbound support, sales, and callbacks on a single professional line. Because the CNMI is a US Commonwealth, a 670 number can typically be provisioned through standard NANP channels — no separate international regulatory process required.
Anchor a genuine CNMI presence without an office
A 670 caller ID reads as domestic to island contacts, tourism operators, and government partners — pickup rates rise measurably vs. an unfamiliar mainland US number.
Serve the wider Micronesia region
The CNMI, Guam (671), and other US Pacific territories cluster geographically and share business networks — a 670 number is a credible base for the whole cluster.
Same NANP tooling as US domestic
670 is a standard NANP area code, so it slots into your existing US phone infrastructure with no special international handling.
US-compliant regulatory framework
The CNMI operates under US federal telecom regulation (FCC), so a 670 number sits inside a well-understood compliance regime.
Cloud-based routing to any team
670 number, US mainland team — the caller sees CNMI, calls route to wherever your team actually sits.
Trans-Pacific coverage from one platform
Pair 670 with US mainland, Guam (671), and Philippines/Japan numbers for a single-platform Pacific presence.
Northern Mariana Islands virtual numbers with My Country Mobile
MCM offers virtual +1 numbers across the NANP with local presence, call forwarding, IVR, and team routing. 670 area-code availability for the CNMI specifically should be confirmed with our team — territory inventory can vary. Where a 670 isn't directly available, we can advise on the closest local-presence option for the CNMI and wider Micronesia region.
Local DIDs in major area codes — provisioned in minutes
Call forwarding to any mobile, landline, SIP endpoint, or softphone worldwide
HD voice with G.711, G.729, Opus & AMR-WB — auto-negotiated per call
Sub-150ms latency on major voice corridors via distributed PoPs
99.99% uptime SLA backed by geo-redundant infrastructure & sub-2s failover
WebRTC support for browser-based calling without softphone installs
REST APIs for provisioning, routing & call detail records (CDRs)
Built-in fraud protection with AI anomaly detection & STIR/SHAKEN
24/7 network monitoring and dedicated support
How to get your Northern Mariana Islands virtual number
Most businesses are live within hours, not days.
Contact our team to confirm current 670 availability — CNMI territory inventory can vary.
If a 670 isn't directly available, we'll propose the closest local-presence alternative (Guam 671, Hawaii, or a general +1 US number).
Configure routing — point the number at a mobile, SIP trunk, softphone, PBX, or IVR anywhere in the world.
Go live — start receiving and making calls with your CNMI/NANP caller ID, backed by MCM's 99.99% uptime SLA.
Other country dialing guides
More country codes worth bookmarking.
Get a Northern Mariana Islands virtual number with MCM
Talk to MCM about NANP coverage — we'll confirm 670 availability and propose the closest local-presence option for the CNMI and Micronesia region.
Northern Mariana Islands +1 670 — FAQ
What is the country code for the Northern Mariana Islands?expand_more
It is +1, with area code 670. Numbers follow the format +1 670 XXX XXXX (a standard 10-digit NANP number).
Is it the same as the US country code?expand_more
Yes. The CNMI is a US Commonwealth inside the North American Numbering Plan, so it shares the +1 country code with the United States. Only the 670 area code identifies it as CNMI-specific.
Do I dial 011 from the US to call the Northern Mariana Islands?expand_more
No. From the US or Canada you dial 1-670-XXX-XXXX — no 011 and no international prefix. The 011 exit code is only for calling foreign countries OUT of the CNMI or US.
How do I call Saipan from the UK?expand_more
Dial 00 1 670 XXX XXXX — your 00 exit code, then +1, then the 670 number.
What is the time zone in the Northern Mariana Islands?expand_more
Chamorro Standard Time, UTC+10, with no daylight saving time. It is typically a day ahead of the Americas, so plan for both hour AND calendar day when scheduling.
What is the emergency number?expand_more
911, reaching police, fire, and medical services — the same nationwide emergency number used across the US.
Which mobile operators serve the islands?expand_more
Primarily IT&E and Docomo Pacific, the same two carriers that operate across neighbouring Guam.
Can I get a 670 virtual number for my business?expand_more
MCM offers virtual numbers with local presence across the NANP. Confirm current 670 availability with our team — territory-specific inventory can vary. Where a 670 number isn't directly available, we can advise on the closest local-presence option for the CNMI and Micronesia region.
Which islands does 670 cover?expand_more
The whole Commonwealth — Saipan (capital and largest), Tinian, and Rota — plus the smaller and largely uninhabited northern islands. There are no separate area codes per island.
How is the CNMI different from Guam?expand_more
Both are US territories in the same time zone (Chamorro Standard Time, UTC+10) with the same +1 country code. The CNMI uses area code 670; Guam uses 671. Politically and administratively they're distinct, but for dialing purposes the pattern is identical.
Do US mobile plans work in the CNMI?expand_more
Many US-based mobile plans include the CNMI in domestic coverage since it's a US territory. However, roaming and data terms vary — confirm with your carrier before arriving.
Why does the time gap with the US mainland change?expand_more
Because the CNMI doesn't observe daylight saving time, but the US mainland does. The gap widens by an hour when the US moves off DST in the fall and narrows again in spring. Always confirm the current offset before booking a live call.