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Area Code Overview
Area code 517 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 849,430.
Overlay and Dialing Rules
- Area Code: 517
- State: Michigan
- Type: General Purpose Code
- In Service Date: January 1, 1947
- Overlay Complex: 517
- Local Dialing Plan: This area does not require you to dial the area code when calling locally.
Estimated Number of Assigned Phone Numbers in Area Code 517
This area code is ranked 189th out of 363 nationwide in estimated assigned phone numbers. Within the state territory it serves, it is ranked 5th out of 12.
4,816,000
Estimated Service-Type Mix of Assigned Phone Numbers in Area Code 517
Wireless
1,472,000 assigned
30.56%
Wireline and VoIP
2,547,000 assigned
52.89%
Other / Unclassified
797,000 assigned
16.55%
Estimated Share of Wireless Numbers Originally Assigned to Each Carrier in Area Code 517
Estimated assigned wireless phone numbers: 1,472,000
Numbers may later be ported to another carrier, but this chart reflects original number assignment, not current subscriber share.
T-Mobile 571,000 (38.79%)
Verizon Wireless 558,000 (37.91%)
AT&T Wireless 342,000 (23.23%)
Optimum Mobile 1,000 (0.07%)
Estimated Share of Wireline and VoIP Numbers Originally Assigned to Each Carrier in Area Code 517
Estimated assigned wireline and VoIP phone numbers: 2,547,000
ACD TELECOM, INC. - MI 200,000 (7.85%)
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 153,000 (6.01%)
Comcast Business 100,000 (3.93%)
TC3 TELECOM, INC. - MI 66,000 (2.59%)
TERRA NOVA TELECOM INC. 50,000 (1.96%)
Peerless Network 42,000 (1.65%)
Other / Unclassified Assigned Numbering in Area Code 517
Estimated assigned other or unclassified phone numbers: 797,000
TELNET WORLDWIDE, INC. 305,000 (38.27%)
123.NET, LLC 112,000 (14.05%)
AMERICAN MESSAGING SERVICES, LLC 100,000 (12.55%)
SPOK, INC. 90,000 (11.29%)
TELEPORT COMMUNICATIONS AMERICA, LLC - MI 79,000 (9.91%)
CLEAR RATE COMMUNICATIONS, LLC 24,000 (3.01%)
BRIGHTSPEED OF CENTRAL MICHIGAN, INC 20,000 (2.51%)
TON80 COMMUNICATIONS, LLC 15,000 (1.88%)
SPRINGPORT TEL. CO. 10,000 (1.25%)
WALDRON TEL. CO. 10,000 (1.25%)
FRACTEL, LLC 9,000 (1.13%)
HD CARRIER LLC 8,000 (1.00%)
Cities and Towns in Area Code 517
Addison, Michigan Adrian, Michigan Albion, Michigan Allen, Michigan Bath, Michigan Bell Oak, Michigan Blissfield, Michigan Britton, Michigan Bronson, Michigan Brooklyn, Michigan Burlington, Michigan Cambria, Michigan Camden, Michigan Charlotte, Michigan Clarklake, Michigan Clayton, Michigan Clinton, Michigan Coldwater, Michigan Concord, Michigan Dansville, Michigan Deerfield, Michigan Dewitt, Michigan Dimondale, Michigan Eaton Rapids, Michigan Fitchburg, Michigan Fowlerville, Michigan Frontier, Michigan Grand Ledge, Michigan Grass Lake, Michigan Hanover, Michigan Hillsdale, Michigan Holt, Michigan Homer, Michigan Howell, Michigan Hudson, Michigan Jackson, Michigan Jonesville, Michigan Laingsburg, Michigan Lansing, Michigan Leslie, Michigan Litchfield, Michigan Mason, Michigan Montgomery, Michigan Morenci, Michigan Mosherville, Michigan Mulliken, Michigan Munith, Michigan Napoleon, Michigan Nashville, Michigan North Adams, Michigan Ogden Center, Michigan Onondaga, Michigan Onsted, Michigan Osseo, Michigan Parma, Michigan Perry, Michigan Portland, Michigan Potterville, Michigan Prattville, Michigan Quincy, Michigan Ransom, Michigan Reading, Michigan Rives Junction, Michigan Sand Creek, Michigan Shaftsburg, Michigan Springport, Michigan Stockbridge, Michigan Sunfield, Michigan Tecumseh, Michigan Tekonsha, Michigan Tipton, Michigan Union City, Michigan Vermontville, Michigan Waldron, Michigan Webberville, Michigan Williamston, Michigan 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 517, 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