Northern Mariana Islands is served by a single area code as of 2026. This guide walks through which code it is, when it was assigned, how it has held up against population growth, and what the prospects look like for additional codes in the future.
The Short Answer
Northern Mariana Islands currently has one active area code in service. The code has held its territory without needing relief since it was assigned, which reflects Northern Mariana Islands’s population size and the rate at which new phone lines are being activated in the state.
Northern Mariana Islands has roughly 47,329 residents as of the most recent estimates. That population, combined with the spread of mobile and VoIP lines per household, determines how often new area codes are needed.
The Northern Mariana Islands Area Code
The active area codes serving Northern Mariana Islands are listed below, in numerical order. Where a code is an overlay or a split-off from an earlier code, that relationship is noted.
- 670 — Entire Commonwealth of the Northern Mariana Islands (Saipan, Tinian, Rota)
How Northern Mariana Islands’s Area Codes Grew Over Time
Northern Mariana Islands received its first area code after the original 1947 NANP launch. The full sequence of code activations and splits is laid out below.
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Browse Northern Mariana Islands Area Codes →- 1997 — 670 became effective on July 1, 1997, when the Commonwealth of the Northern Mariana Islands joined the North American Numbering Plan, replacing access via the ITU international country code 670. A permissive dialing period ran from July 1, 1997, to July 1, 1998, during which the old international code remained operational.
What’s Next for Northern Mariana Islands Area Codes
Area code 670 remains the sole numbering plan area for the Northern Mariana Islands and is in no danger of exhaust. With a population of fewer than 50,000 spread across the islands of Saipan, Tinian, and Rota, the territory uses only a small fraction of the roughly 7.9 million numbers a single area code can hold. NANPA’s relief planning shows no overlay or split scheduled for 670, and none is expected for the foreseeable future. The code also remains one of a small number of NANP area codes that still permit seven-digit local dialing, a sign of how lightly its numbering pool is used.
Frequently Asked Questions
How many area codes does Northern Mariana Islands have?
Northern Mariana Islands has one active area code in service. Demand has not yet pushed the territory into needing relief through a split or an overlay.
What is the oldest area code in Northern Mariana Islands?
670 is the oldest active area code in Northern Mariana Islands, assigned in 1997. It remains in service today.
What area code does the Northern Mariana Islands use?
The Northern Mariana Islands uses a single area code, 670, which covers the entire commonwealth including Saipan, Tinian, and Rota. There are no overlay or split codes, so every local landline and the territory’s fixed lines share the 670 code.
When did the Northern Mariana Islands get area code 670?
Area code 670 went into service on July 1, 1997, when the commonwealth joined the North American Numbering Plan. Before that, calls from the U.S. mainland to the islands were placed as international calls using the ITU country code 670, which was later reassigned to East Timor.
Is 670 a U.S. area code or an international code?
670 is a domestic U.S. area code within the North American Numbering Plan, dialed as 1-670 from the mainland just like any other U.S. area code. The Federal Communications Commission treats calls between the mainland and the commonwealth as domestic, though some mobile carriers may bill them differently.
Will the Northern Mariana Islands get a second area code?
There are no plans for a second area code. The territory’s small population uses only a fraction of the numbers available in 670, and the code still allows seven-digit local dialing, so no overlay or split is projected.
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We carry available Northern Mariana Islands numbers right now. Order a 670 number directly — a one-time fee, no monthly charges, with pricing From $150 depending on the digit pattern and memorability of the number. Prefer help choosing? Call us at (212) 580-2000.
Related Reading
- Where Is Area Code 670 Located?
- How Many Area Codes Are in the US
- How Do Area Codes Work
- How Are Area Codes Assigned
- Who Invented Area Codes
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