Michigan area codes
Michigan uses 13 area codes. The oldest is 313, in service since 1947; the newest is 679, from 2025. Across them 6,881 of 10,218 possible number blocks are allocated, 67.3% of capacity. 248 and 313 are at or past 95%, which is why new numbers there come from overlays rather than the original code. AT&T holds 34.0% of the 6,881 assigned blocks across the state, ahead of Verizon at 14.5%; a further 13.8% sits with CLEC and VoIP holders outside the national carriers. In the 33 days to 30 October 2026, FTC complaints named a Michigan caller ID 6,441 times – 2.8% of all complaints in the window, most often 231 with 978 (42nd of 422 nationally). The state spans 2 time zones (Eastern and Central); 906 crosses a zone boundary alone. NANPA records 658 rate centers across the state's codes.
All 13 codes
| Code | In service | Blocks used | Largest holder | Complaints | Shares area with |
|---|---|---|---|---|---|
| 231 | 1999 | 572/786 | AT&T 26.9% | 978 | no overlay |
| 248 | 1997 | 784/786 | AT&T 45% | 555 | 947 |
| 269 | 2002 | 545/786 | AT&T 32.8% | 533 | no overlay |
| 313 | 1947 | 769/786 | AT&T 46.9% | 672 | 679 |
| 517 | 1947 | 616/786 | AT&T 25.6% | 627 | no overlay |
| 586 | 2001 | 546/786 | AT&T 33.9% | 386 | no overlay |
| 616 | 1947 | 545/786 | AT&T 34.5% | 544 | no overlay |
| 679 | 2025 | 0/786 | – | – | 313 |
| 734 | 1997 | 701/786 | AT&T 34.4% | 664 | 679 |
| 810 | 1993 | 509/786 | AT&T 36.7% | 706 | no overlay |
| 906 | 1961 | 360/786 | Other CLEC / VoIP 45.3% | 128 | no overlay |
| 947 | 2002 | 211/786 | Verizon 34.6% | 118 | 248 |
| 989 | 2001 | 723/786 | AT&T 24.6% | 530 | no overlay |
Block share is share of allocated number blocks, not of subscribers. Complaint counts cover 28 Sep – 30 Oct 2026 and reflect spoofed caller IDs as much as real calls.
How full Michigan’s codes are
A code holds at most 786 blocks of 10,000 numbers each. When a code fills up, the administrator does not reclaim numbers – it adds an overlay, and from then on new numbers in the same area come from the new code.
Full or nearly full
679 is in service with no blocks assigned at all, so nobody can hold a number there yet – a caller ID showing one is necessarily spoofed.
Who holds the number blocks
Counted from every assigned block in the state: 6,881 blocks, each with the holder NANPA recorded for it. Percentages are measured, not estimated.
| Holder | Blocks | Share of Michigan | Largest in |
|---|---|---|---|
| AT&T | 2,342 | 34% | 10 codes |
| Verizon | 996 | 14.5% | 1 code |
| Other CLEC / VoIP | 950 | 13.8% | 1 code |
| T-Mobile | 712 | 10.3% | – |
| Onvoy | 368 | 5.3% | – |
| Lumen | 328 | 4.8% | – |
| Frontier | 303 | 4.4% | – |
| Windstream | 197 | 2.9% | – |
| American Messaging | 164 | 2.4% | – |
| Bandwidth | 119 | 1.7% | – |
| Spok | 92 | 1.3% | – |
| Charter | 91 | 1.3% | – |
“Other CLEC / VoIP” is not one company: it is every holder outside the national carriers counted together, which is what resellers and app-based numbers look like in the records. This is allocation, not subscribers.
Spam complaints naming Michigan codes
FTC Do Not Call complaints where the caller ID shown was a Michigan number, 28 Sep – 30 Oct 2026 (33 days). Caller IDs on spam calls are routinely faked, so these are complaints about the code, not calls proven to come from it.
How Michigan got its codes
3 in the 1940s, 1 in the 1960s, 4 in the 1990s, 4 in the 2000s, 1 in the 2020s. Each code after the first was split off from or overlaid on one already in service.
- 1947 313 goes into service, split from or overlaid on 313.
- 1947 517 goes into service.
- 1947 616 goes into service.
- 1961 906 goes into service.
- 1993 810 goes into service, split from or overlaid on 313.
- 1997 248 goes into service, split from or overlaid on 810.
- 1997 734 goes into service, split from or overlaid on 313.
- 1999 231 goes into service, split from or overlaid on 616.
- 2001 586 goes into service, split from or overlaid on 810.
- 2001 989 goes into service, split from or overlaid on 517.
- 2002 269 goes into service, split from or overlaid on 616.
- 2002 947 goes into service, split from or overlaid on 248.
- 2025 679 goes into service, split from or overlaid on 313.
Time zones
Michigan is in Eastern, Central time. 906 covers more than one zone within a single area code, so the code alone does not tell you what time it is there. This code spans 2 time zones.
Frequently asked about Michigan area codes
How many area codes does Michigan have?
13 in service. They are 231, 248, 269, 313, 517, 586, 616, 679, 734, 810, 906, 947 and 989.
What is the oldest area code in Michigan?
313, in service since 1947. Every later code in the state was split off from or overlaid on an existing one.
What is the newest area code in Michigan?
679, from 2025, overlaying 313.
Is Michigan running out of numbers?
248 and 313 are at or past 95% of capacity, but NANPA has not opened relief planning for them, so no new code is announced.
What time zone is Michigan in?
It spans 2: Eastern and Central. 906 covers more than one zone within a single area code, so the code alone does not tell you the time.
Which Michigan area code gets the most spam complaints?
231 – 978 FTC complaints in the 33 days to 30 October 2026, 42nd of 422 codes nationally. Those are complaints about the caller ID shown, and spam callers routinely fake a local-looking number, so this says the code is imitated often, not that the calls come from there.
Which carrier holds the most Michigan numbers?
AT&T, with 34.0% of the 6,881 blocks assigned across Michigan, ahead of Verizon at 14.5%. This is allocation of blocks by the numbering administrator, not a count of subscribers – people keep their numbers when they switch carriers.
Sources and verification
- NANPA – NPA Database (npa_report.csv), file date 11/01/2026, retrieved Nov 1, 2026
- NANPA – CO Code Assignment Records, All States (utilized), file updated 11/01/2026, retrieved Nov 1, 2026
- FTC – Do Not Call Reported Calls Data, 28 Sep – 30 Oct 2026, retrieved Nov 1, 2026
Figures on this page are counted from those files, not copied from other sites. Spotted an error? Request a correction. How we collect and check: methodology.