Northern Mariana Islands Area Codes
Directory of all 1 telephone area codes assigned to Northern Mariana Islands.
Northern Mariana Islands phone numbers are served by 1 area code operating in the Chamorro (ChST) timezone.10-digit or 7-digit local dialing applies depending on the exact number. No area codes in Northern Mariana Islands are currently flagged as high-risk scams.
Most populated prefix: area code 670 (Northern Mariana Islands)
All Area Codes in Northern Mariana Islands
Major Cities Served by Northern Mariana Islands Area Codes
The most populous urban centers and census places covered by Northern Mariana Islands's area codes, ranked by population.
Northern Mariana Islands Area Code FAQs
Quick answers to common questions about Northern Mariana Islands telephone area codes.
How many area codes does Northern Mariana Islands have?
Northern Mariana Islands has 1 area codes: 670.
What timezone do Northern Mariana Islands area codes use?
Northern Mariana Islands area codes operate in the Chamorro (ChST) timezone.
What is the most populated area code in Northern Mariana Islands?
Area code 670 is the most populous prefix in Northern Mariana Islands based on covered city population.
Does Northern Mariana Islands use overlay area codes?
Northern Mariana Islands currently has no overlay code pairs listed in our directory.
Are there scam area codes in Northern Mariana Islands?
Northern Mariana Islands has no area codes currently flagged as high-risk scams.
About Northern Mariana Islands Area Codes & Phone Dialing Rules
When placing calls within Northern Mariana Islands, ten-digit dialing (area code + 7-digit telephone number) is required in overlay regions where multiple area codes serve the same geographic boundaries.