Michigan has 13 active area codes serving cities across its Lower Peninsula and Upper Peninsula. Most of the state operates in Eastern Time (ET), while four western Upper Peninsula counties follow Central Time (CT). Whether you need to identify incoming calls, plan business communications across regions, or stay informed about area code changes, this guide provides current and verified information about every Michigan area code.
IMPORTANT UPDATE: Area code 679 is now active as of November 7, 2025, serving as an overlay for Detroit’s 313 area code. All 313/679 callers must use 10-digit dialing for local calls.
Quick Reference Table: Michigan Area Codes
| Area Code | Primary Cities/Regions | Time Zone | Type | Year Introduced |
|---|---|---|---|---|
| 231 | Traverse City, Muskegon, Petoskey | EST | Split | 1999 |
| 248 | Troy, Southfield, Pontiac | EST | Split | 1997 |
| 269 | Kalamazoo, Battle Creek, Benton Harbor | EST | Split | 2002 |
| 313 | Detroit, Dearborn, Grosse Pointes | EST | Original | 1947 |
| 517 | Lansing, Jackson, East Lansing | EST | Original | 1947 |
| 586 | Warren, Sterling Heights, St. Clair Shores | EST | Split | 2001 |
| 616 | Grand Rapids, Holland, Grand Haven | EST | Original | 1947 |
| 679 | Detroit, Dearborn (overlay) | EST | Overlay | 2025 (Active) |
| 734 | Ann Arbor, Monroe, Ypsilanti | EST | Split | 1997 |
| 810 | Flint, Port Huron, Lapeer | EST | Split | 1993 |
| 906 | Marquette, Sault Ste. Marie, Escanaba | EST/CST | Split | 1961 |
| 947 | Troy, Southfield (overlay) | EST | Overlay | 2002 |
| 989 | Saginaw, Bay City, Midland | EST | Split | 2001 |
Detailed Code Descriptions
Area Code 231
Serves northwestern Lower Michigan including Traverse City, Muskegon, Ludington, Petoskey, and Big Rapids. Created June 5, 1999, splitting from 616 due to tourism growth and mobile phone expansion. Covers Grand Traverse, Muskegon, Mason, Emmet, and Wexford counties in Eastern Time. Serves approximately 500,000 residents, with seasonal populations significantly higher duringthe summer. Most areas allow 7-digit local dialing.
Area Code 248
Covers Oakland County’s northern Detroit suburbs, including Troy, Southfield, Farmington Hills, Pontiac, Rochester Hills, and Royal Oak. Split from 810 on May 10, 1997. Received overlay code 947 in 2002. Serves 1.3 million residents in Eastern Time. All calls require 10-digit dialing due to the 248/947 overlay. Home to automotive headquarters and major business districts.
Area Code 269
Serves southwestern Michigan including Kalamazoo, Battle Creek, Benton Harbor, and St. Joseph. Split from 616 on July 13, 2002. Covers Kalamazoo, Calhoun, Berrien, and Van Buren counties in Eastern Time. Serves approximately 850,000 residents. Most areas allow 7-digit local dialing. The region includes universities, cereal industry heritage, and Lake Michigan resort communities.
Area Code 313
One of Michigan’s three original 1947 codes, covering Detroit, Dearborn, Hamtramck, Highland Park, Grosse Pointes, and nearby suburbs. Culturally iconic, appearing in music, business names, and local pride. March 13 (3/13) celebrated as Detroit day. Now requires 10-digit dialing as of October 7, 2025, due to the new 679 overlay launching November 7, 2025. Serves approximately 2 million residents in Wayne County’s urban core in Eastern Time.
Area Code 517
Original 1947 code serving south central Michigan and the state capital. Includes Lansing, East Lansing, Jackson, Charlotte, and Howell. Covers Ingham, Jackson, Eaton, and Clinton counties. Home to Michigan State University and the state government. Serves approximately 1.1 million residents in Eastern Time. Most areas allow 7-digit local dialing.
Area Code 586
Covers Macomb County in northeastern Metro Detroit. Major cities include Warren, Sterling Heights, and Clinton Township. Created September 22, 2001, splitting from 810. Serves approximately 880,000 residents in Eastern Time. Strong manufacturing and automotive presence. Most areas allow 7-digit local dialing.
Area Code 616
One of Michigan’s original 1947 codes serving western Michigan. The largest city is Grand Rapids, Michigan’s second-largest city. Includes Holland, Grand Haven, and Zeeland. Originally covered western Michigan and Upper Peninsula before splits in 1961, 1999, and 2002. Covers Kent, Ottawa, and Ionia counties. Serves approximately 1.4 million residents in Eastern Time. Most areas allow 7-digit local dialing.
Area Code 679
Michigan’s newest area code, launched on November 7, 2025, as an overlay for 313. Covers identical geography: Detroit, Dearborn, Hamtramck, Highland Park, and nearby suburbs. New phone lines receive 679 numbers, as 313 numbers are assigned. All calls require 10-digit dialing (mandatory since October 7, 2025). Existing 313 numbers unchanged. Serves the Eastern Time zone.
Area Code 734
Covers western and southeastern Wayne County, including Ann Arbor, Monroe, Ypsilanti, and Romulus. Split from 313 on December 13, 1997. Home to the University of Michigan and Detroit Metropolitan Airport. Covers Wayne and Washtenaw counties. Serves approximately 1.4 million residents in Eastern Time. Most areas allow 7-digit local dialing.
Area Code 810
Serves the Flint area and the Thumb region, including Port Huron, Brighton, and Lapeer. Created December 1, 1993, as Michigan’s first split from 313. Covers Genesee, St. Clair, Livingston, and Lapeer counties. Serves approximately 900,000 residents in Eastern Time. Most areas allow 7-digit local dialing.
Area Code 906
Covers Michigan’s entire Upper Peninsula, including Marquette, Sault Ste. Marie, Escanaba, and Iron Mountain. Created March 19, 1961, splitting from 616. Despite covering 30% of Michigan’s land, it serves only 300,000 residents. Spans two time zones: most areas follow Eastern Time, but Gogebic, Iron, Dickinson, and Menominee counties observe Central Time. Most areas allow 7-digit local dialing.
Area Code 947
Overlay for 248 serving Oakland County. Introduced September 7, 2002, due to the number exhaustion in the rapidly growing 248 area. Both codes serve the same geography, including Troy, Southfield, and Pontiac. All calls require 10-digit dialing. Serves 1.3 million residents in Eastern Time.
Area Code 989
Covers northern, northeastern, and central Lower Michigan, including Saginaw, Bay City, Midland, Mount Pleasant, and Alpena. Created April 7, 2001, splitting from 517. Serves approximately 800,000 residents across diverse communities from Tri-Cities to northern resort areas. Covers Saginaw, Bay, Midland, and Isabella counties in Eastern Time. Most areas allow 7-digit local dialing.
Understanding Time Zones in Michigan
Most of the state follows Eastern Time (ET), which is UTC-5 during standard time and UTC-4 during daylight saving time. Four western Upper Peninsula counties observe Central Time (CT): Gogebic, Iron, Dickinson, and Menominee. These counties are one hour behind the rest of Michigan because they border Wisconsin and maintain ties with Wisconsin communities.
When scheduling calls across this state, remember this time difference. A 9:00 AM call in Detroit (Eastern) equals 8:00 AM in Iron Mountain (Central). Michigan observes daylight saving time statewide, with clocks springing forward in March and falling back in November.
Michigan Cities and Their Area Codes
| City | Area Code(s) | Time Zone | Description |
|---|---|---|---|
| Detroit | 313, 679 | Eastern Time | State’s largest city |
| Grand Rapids | 616 | Eastern Time | Second-largest city |
| Warren | 586 | Eastern Time | Third-largest city |
| Sterling Heights | 586 | Eastern Time | Major automotive hub |
| Ann Arbor | 734 | Eastern Time | University of Michigan |
| Lansing | 517 | Eastern Time | State capital |
| Flint | 810 | Eastern Time | Historic automotive city |
| Dearborn | 313, 679 | Eastern Time | Ford Motor Company HQ |
| Livonia | 248, 734, 947 | Eastern Time | Major suburb |
| Troy | 248, 947 | Eastern Time | Business center |
| Kalamazoo | 269 | Eastern Time | College town |
| Southfield | 248, 947 | Eastern Time | Business district |
How to Use Area Codes in Michigan
10-Digit Dialing Required:
- All of 313/679 area (Detroit region)
- All of 248/947 area (Oakland County)
7-Digit Local Dialing Allowed:
- 231, 269, 517, 586, 616, 734, 810, 906, 989
Even where 7-digit dialing works, using 10 digits for all calls is recommended for consistency and future compatibility.
Within Michigan: Dial area code + phone number (10 digits) or just the 7 digits where allowed.
From Outside Michigan: Dial 1 + area code + phone number. Example: 1-313-555-0123.
International Calls to Michigan: Dial your country’s exit code + 1 + area code + phone number.
Always save mobile contacts with full 10-digit numbers, including area codes, to ensure calls connect properly.
Frequently Asked Questions
How many area codes does Michigan have?
Michigan currently has 13 active area codes: 231, 248, 269, 313, 517, 586, 616, 679, 734, 810, 906, 947, and 989. The newest code, 679, launched on November 7, 2025, as an overlay for Detroit’s 313 area code. Two area codes (248/947 and 313/679) operate as overlays, where both codes serve identical geographic areas.
Do I need to dial the area code for local calls in Michigan?
It depends on your location. In the 313/679 area (Detroit) and 248/947 area (Oakland County), you must dial all 10 digits for every call, including local calls. Most other Michigan area codes still allow 7-digit local dialing, but 10-digit dialing works everywhere and is recommended as future overlays may require it.
What is the oldest area code in Michigan?
Michigan’s three original area codes from 1947 are 313 (Detroit), 517 (Lansing), and 616 (Grand Rapids). These were established when AT&T and the Bell System created the North American Numbering Plan. All three remain in service today, though their coverage areas have shrunk through multiple splits and one overlay.
Are new area codes planned for Michigan?
Area code 679 launched on November 7, 2025, as an overlay for the 313 area code in Detroit and is now in active service. Beyond this, no additional area codes are currently planned for Michigan. The 679 overlay is expected to provide sufficient numbers for the Detroit region for many decades, according to projections from the North American Numbering Plan Administration.
Area Code 278 for Michigan’s Ann Arbor region, is it coming or not? Complete guide.
Additional Resources
For more information about Michigan area codes and telecommunications:
- Michigan Public Service Commission: State regulatory body overseeing telecommunications
- North American Numbering Plan Administration (NANPA): Official source for area code assignments
- Individual City Pages: Check our specific city guides for local calling information
- Time Zone Information: Use online time zone converters when scheduling calls across Michigan’s two time zones
Last updated: December 2025. Area code information verified against the NANPA database and Michigan Public Service Commission announcements.