Home

313 Area Code

Area Code Overview

Area code 313 is a geographic telephone area code in Michigan that went into service on January 1, 1947. The geographic regions covered by this area code overlay has a population of approximately 1,215,126.

Overlay and Dialing Rules

  • Area Code: 313
  • State: Michigan
  • Type: General Purpose Code
  • In Service Date: January 1, 1947
  • Overlay Complex: 313/679/734
  • Local Dialing Plan: This area does require you to dial the area code when calling locally.

Estimated Number of Assigned Phone Numbers in Area Code 313

This area code is ranked 43rd out of 363 nationwide in estimated assigned phone numbers. Within the state territory it serves, it is ranked 1st out of 12.

6,614,000

Estimated Service-Type Mix of Assigned Phone Numbers in Area Code 313

Total assigned 6,614,000
Wireless
3,072,000 assigned
46.45%
Wireline and VoIP
3,007,000 assigned
45.46%
Other / Unclassified
535,000 assigned
8.09%

Estimated Share of Wireless Numbers Originally Assigned to Each Carrier in Area Code 313

Estimated assigned wireless phone numbers: 3,072,000

Numbers may later be ported to another carrier, but this chart reflects original number assignment, not current subscriber share.

T-Mobile 1,881,000 (61.23%)
AT&T Wireless 668,000 (21.74%)
Verizon Wireless 523,000 (17.02%)

Estimated Share of Wireline and VoIP Numbers Originally Assigned to Each Carrier in Area Code 313

Estimated assigned wireline and VoIP phone numbers: 3,007,000

AT&T 1,619,000 (53.84%)
Onvoy 451,000 (15.00%)
Bandwidth 381,000 (12.67%)
Comcast Business 112,000 (3.72%)
Lumen 110,000 (3.66%)
PAETEC ITEL, LLC 85,000 (2.83%)
Spectrum 78,000 (2.59%)
Peerless Network 57,000 (1.90%)
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 45,000 (1.50%)
Commio 15,000 (0.50%)
WOW! INTERNET, CABLE AND PHONE 12,000 (0.40%)
Vonage 10,000 (0.33%)

Other / Unclassified Assigned Numbering in Area Code 313

Estimated assigned other or unclassified phone numbers: 535,000

AMERICAN MESSAGING SERVICES, LLC 240,000 (44.86%)
SPOK, INC. 130,000 (24.30%)
TELNET WORLDWIDE, INC. 62,000 (11.59%)
TELEPORT COMMUNICATIONS AMERICA, LLC - MI 41,000 (7.66%)
CLEAR RATE COMMUNICATIONS, LLC 13,000 (2.43%)
123.NET, LLC 12,000 (2.24%)
FIRST COMMUNICATIONS, LLC 8,000 (1.50%)
GRID 4 COMMUNICATIONS, INC. - MI 8,000 (1.50%)
FRACTEL, LLC 5,000 (0.93%)
HD CARRIER LLC 5,000 (0.93%)
STRATUS NETWORKS 3,000 (0.56%)
FIVE9, INC. 2,000 (0.37%)

Cities and Towns in Area Code 313

Ann Arbor, Michigan Belleville, Michigan Carleton, Michigan Chelsea, Michigan Detroit, Michigan Dexter, Michigan Dundee, Michigan Erie, Michigan Flat Rock, Michigan Gregory, Michigan Ida, Michigan Lambertville, Michigan Livonia, Michigan Manchester, Michigan Maybee, Michigan Milan, Michigan Monroe, Michigan New Boston, Michigan Newport, Michigan Petersburg, Michigan Pinckney, Michigan Plymouth, Michigan Rockwood, Michigan Romulus, Michigan Saline, Michigan Temperance, Michigan Trenton, Michigan Wayne, Michigan Whitmore Lake, Michigan Willis, Michigan Wyandotte, Michigan Ypsilanti, Michigan

These geographic regions are also served by area codes 679 and 734.

How These Figures Were Built

These figures are estimates based on public phone-number assignment records. They are meant to show the likely mix of assigned phone numbers associated with area code 313, not live customer counts.

Some providers may have assigned phone numbers tied to this area code even if they do not actively market or sell service locally. These figures reflect public number-assignment records, not confirmed local service availability.

They also do not reflect number portability at the individual phone-number level, so some numbers may now be used on a different network or by a different provider than the original assignment records suggest.

Population data and locality matching provided by GeoNames.

Last refreshed: April 15, 2026 6:22 pm