906
Area code
MI
United States geographic area code, in service since 1961-03-19.
Statusin service
Introduced1961-03-19
JurisdictionMI, US
Local dialing10D
Time zoneEastern / Central
Last verified2026-09-17
Utilization 47.2% of assignable prefixes assigned
As of 09/17/2026
0%374 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 2001-04-19, most recent 2026-09-11.
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 | MICHIGAN BELL TEL CO | 67 | 17.9% |
| 02 | PENINSULA FIBER NETWORK, LLC - MI | 42 | 11.2% |
| 03 | NEW CINGULAR WIRELESS PCS, LLC - IL | 32 | 8.6% |
| 04 | RANGE TELECOMMUNICATIONS | 30 | 8% |
| 05 | TELNET WORLDWIDE, INC. | 28 | 7.5% |
| 06 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 28 | 7.5% |
| 07 | ONVOY, LLCV - MI | 20 | 5.3% |
| 08 | UPPER PENINSULA TEL. CO. | 15 | 4% |
| 09 | LEVEL 3 COMMUNICATIONS, LLC - MI | 12 | 3.2% |
| 10 | HIAWATHA TEL. CO. | 11 | 2.9% |
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- 1961-03-19Area code 906 entered service.
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 2021-01-08 | PL-556 ↗ | Transition to 10-digit dialing (for 988 as 3-digit access to National Suicide Prevention Lifeline) – supersedes PL-544 |
| 2020-08-17 | PL-544 ↗ | Transition to 10-digit dialing (for 988 as 3-digit access to National Suicide Prevention Hotline |