586
Area code
Statusin service
Introduced2001-09-22
JurisdictionMI, US
Local dialing7D
Time zoneEastern
Last verified2026-09-17
Utilization 72% of assignable prefixes assigned
As of 09/17/2026
0%570 of ~792 assignable NXX values (200–999 excl. N11)100%
Prefix-level assignment does not equal number-level exhaustion; thousands-block pooling extends capacity. First assignment on record 2001-02-15, most recent 2026-07-01.
Area codes serve rate-center geographies, not municipal boundaries. “MI” identifies the jurisdiction, not an exact city footprint.
Top assignees
Ranked by assigned prefixes · initial assignee ≠ current carrier| Rank | Assignee | Prefixes | Share |
|---|---|---|---|
| 01 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 132 | 23.2% |
| 02 | MICHIGAN BELL TEL CO | 100 | 17.5% |
| 03 | NEW CINGULAR WIRELESS PCS, LLC - IL | 60 | 10.5% |
| 04 | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 43 | 7.5% |
| 05 | AMERICAN MESSAGING SERVICES, LLC | 27 | 4.7% |
| 06 | LEVEL 3 COMMUNICATIONS, LLC - MI | 26 | 4.6% |
| 07 | ONVOY, LLCV - MI | 24 | 4.2% |
| 08 | METROPCS, INC. | 23 | 4% |
| 09 | TELEPORT COMMUNICATIONS AMERICA, LLC - MI | 22 | 3.9% |
| 10 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI | 22 | 3.9% |
Important: these are initial assignees from NANPA CO-code records — the carrier a prefix was originally assigned to. Because of number portability, the current serving carrier of any individual number may differ.
Change history
Recorded events for this NPA- 2001-09-22Area code 586 entered service (created from 810).
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 2001-06-05 | PL-282 ↗ | 810 / 586 NPA Split (Michigan) - Wireless NXX Grandfathering |
| 2001-04-30 | PL-273 ↗ | 810 / 586 NPA Split - Wireless NXX Grandfathering (Michigan) |
| 2001-03-01 | PL-265 ↗ | 810 NPA Split, Creating 586 NPA (Michigan) |
| 2000-03-10 | PL-221 ↗ | Suspension of Code Assignments in the 586 NPA Michigan |
| 1999-09-02 | PL-192 ↗ | NANP - Overlay of 810 Numbering Plan Area (NPA) with 586 NPA - Michigan |