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313 Area Code

Area code 313 serves Detroit, Dearborn, Hamtramck and Highland Park in Michigan. It has been in service since January 1, 1947, when it was split from 313.

StateMichigan
Time zoneEastern
Local time now…
Prefixes in use769
Overlay with679
Projected to run out2091
DetroitDearbornHamtramckHighland ParkDetroitDearborn
Cities and towns served by area code 313

Who issues 313 numbers

Mobile 38%VoIP and cable 18%Landline 45%

Share of the 769 prefixes (the three digits after 313) assigned to each type of carrier. Classification by carrier name, approximate.

CarrierPrefixes
AT&T (Michigan Bell)244
T-Mobile141
AT&T Mobility95
Verizon Wireless54
Bandwidth28
Onvoy (Sinch)28
Verizon Business (MCImetro)25
American Messaging Services24

Cities and towns in area code 313

CityPopulationOther area codes
Detroit649,095
Dearborn105,611
Hamtramck27,261
Highland Park8,248

Got a call from 313?

A 313 number was originally issued in Michigan, but that does not prove the caller is there. 18% of 313 prefixes belong to VoIP and cable providers, whose numbers can be bought online and used from anywhere. Caller ID can also be spoofed, so treat urgent requests for money, codes or passwords from any area code with suspicion, and call back on a number you already know.

All 769 prefixes in area code 313

Format: (313) XXX-YYYY. Carrier is the company the block was originally assigned to; numbers may since have been ported to another carrier.

Questions about area code 313

Where is area code 313?
Area code 313 is in Michigan. It covers Detroit, Dearborn, Hamtramck and Highland Park.
What time zone is area code 313?
Area code 313 is in the Eastern time zone.
Is 313 a toll-free number?
No. 313 is a geographic area code in Michigan. Toll-free numbers in the US start with 800, 833, 844, 855, 866, 877 or 888.
Why does 313 share its area with 679?
313 and 679 form an overlay: they cover the same territory, so new numbers there can get any of these codes, and local calls need all 10 digits.
Will area code 313 run out of numbers?
NANPA's latest forecast projects the 313/679 overlay to exhaust in the second quarter of 2091. Before that happens, a new area code is usually added as an overlay; existing numbers keep their code.

Other area codes in Michigan