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Area code 231

Area code 231 serves Michigan, including Muskegon, Traverse City and Petoskey (Eastern time). It has been in service since June 5, 1999.

Numbers starting with 231 drew 2,329 reports to the FTC from Aug 14, 2026 to Nov 11, 2026 and 633 complaints to the FCC since November 2023. The number on your screen can be faked, so a 231 number proves nothing about where a call came from.

Location
Michigan(grand Rapids--Muskegon--Holland, MI Msa) and (grand Rapids-Kentwood, MI Metropolitan Statistical Area)
Time zone
Eastern
In service since
June 5, 1999Created from 616
Overlay
None: the only code for its area
Local calls
Dial 7 digits
Exchanges in use
572 of 792held by 43 carriers
Projected to run out
2Q 2085NANPA forecast 2026.2

Complaints about 231 numbers

Reports where the number on the consumer's caller ID (or, for the FCC, the number the caller asked them to call back) starts with 231. These are counts of what people reported; the agencies do not verify them.

FTC reports, Aug 14, 2026 to Nov 11, 2026

2,329

FCC complaints since November 2023

633

Different 231 numbers reported

2,774

FCC complaints naming a 231 number, by month

November 2023 to October 2026. Source: FCC Consumer Complaints Data.

Show as a table
MonthComplaints
November 202311
December 202313
January 202411
February 20249
March 202411
April 202417
May 202427
June 202410
July 202414
August 202424
September 202423
October 202441
November 202426
December 202419
January 202529
February 202519
March 202533
April 202532
May 202515
June 20259
July 202515
August 202513
September 202515
October 20250
November 20256
December 202512
January 202616
February 20269
March 202610
April 202612
May 202618
June 202614
July 202624
August 202623
September 202616
October 202621

What people said 231 calls were about

Subjects picked in FTC reports, August 14, 2026 to November 11, 2026. 1,670 of 2,329 reports were robocalls.

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SubjectReports
Other965
Reducing your debt (credit cards, mortgage, student loans)653
Dropped call or no message232
Medical and prescriptions152
Calls pretending to be government, businesses, or family and friends141
Home improvement and cleaning20

Places served by 231

NANPA lists 99 rate centers for 231. A rate center is the town or district a block of numbers is tied to for billing; sorted here by how many exchanges each holds.
  • Muskegon68
  • Traverse City53
  • Petoskey22
  • Cadillac21
  • Big Rapids19
  • Ludington14
  • Cheboygan13
  • Manistee12
  • Kalkaska10
  • Fremont9
  • Newaygo9
  • Boyne City8
  • Beulah7
  • Charlevoix7
  • Frankfort7
  • Harbor Springs7
  • Hart7
  • Northport7
  • Reed City7
  • Evart6
  • Fife Lake6
  • Glen Lake6
  • Mcbain6
  • Morley6
Show all 99 rate centers

Baldwin, Bellaire, Coral, East Jordan, Elmira, Grant, Mackinaw City, Mancelona, Scottville, Whitehall, Wolverine, Alanson, Alden, Central Lake, Fruitport, Honor, Howard City, Lake Ann, Lake City, Mecosta, Moorestown, Onekama, Pentwater, Shelby, White Cloud, Williamsburg, Bear Lake, Boyne Falls, Brutus, Eastport, Elk Rapids, Falmouth, Fountain, Freesoil, Harrietta, Hesperia, Holton, Indian River, Interlochen, Irons, Kingsley, Lake Leelanau, Le Roy, Levering, Luther, Manton, Marion, Merritt, Ravenna, Suttons Bay, Tustin, Twin Lake (muskegon), Walloon Lake, Alba, Amble, Brethren, Buckley, Carr, Chippewa Lake, Clam River, Dublin, Ellsworth, Kaleva, Lakes of the North, Mesick, Pellston, Saint James, Stanwood, Torch River Bridge, Wellston, Bois Blanc, Copemish-Thompsonville, Hoxeyville, Old Mission, South Boardman.

Phone companies holding 231 exchanges

Each exchange (the three digits after the area code) is assigned to one carrier. 67% of these exchanges are pooled: their numbers are handed out in blocks of 1,000 to other carriers, so the holder below is not always the company serving a given number.

Exchanges held, top 8 of 43 carriers

NANPA central office code assignments, file of November 11, 2026.

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Carrier (legal name)Exchanges
New Cingular Wireless PCS, LLC - IL72
Michigan Bell Tel CO70
Frontier North, Inc. - MI52
Onvoy, Llcv - MI49
Interactive Services Network, Inc.43
Cellco Partnership dba Verizon Wireless - MI42
123.net, LLC34
Omnipoint Communications Midwest Operations, LLC28

When today's 231 exchanges were assigned

Exchanges still assigned, by year of assignment. Exchanges returned since are not counted.

Show as a table
YearExchanges
200130
200262
20038
200424
200511
20061
20071
20081
20091
20102
20115
20126
20131
20147
201514
20168
20177
20185
201910
20209
202135
202216
202311
20242
20253
20261

Check a 231 number

A check shows the carrier and rate center of the number's exchange and every FTC and FCC report about that exact number. Why the number on screen can be fake.

Other area codes in Michigan

NANPA area code database and central office code file of November 11, 2026; FCC complaints November 1, 2023 to November 11, 2026; FTC reports August 14, 2026 to November 11, 2026. How the data is used.

Official sources (7)Show