North American Numbers Source-cited · ownership disclosed
Area code
906
In service
United States · since 1961

Upper Peninsula

Michigan's entire Upper Peninsula, split from area code 616 in 1961; one of the least populous numbering plan areas in North America.

The essentials Numbering data · NumberResearch · as of 2026-09-18
Place
Upper Peninsula
Type
geographic
Status
in service
In service since
1961
Projected exhaust
2166 Q2

Status, dates and counts are read from NumberResearch (NANPA / CNAC / FCC records). Assignment records show initial assignees, not the carrier serving a number today.

A · Where it is

Where 906 is

All of the Upper Peninsula of Michigan..

Communities served wholly or partly by 906:

MarquetteSault Ste. MarieEscanabaIron MountainHoughtonMenominee

Bois Blanc Township uses 231; includes Isle Royale and Mackinac Island.

B · Relationships

How it relates to other codes

The codes 906 was split from, spawned, or shares its area with. A split divides the map and changes some numbers; an overlay shares the same ground and changes none — what's the difference?

Split from · 1961 616 Grand Rapids Split from 616.
Related 231 Traverse City / Muskegon Adjacent Lower Peninsula code to the south.
What's changing. No overlay; single code, 10-digit dialing since 2021.
C · History

How 906 got here

1961-03-19
Split from area code 616 to serve the Upper Peninsula; done as a flash cut with no permissive dialing period.
Source: Wikipedia
2021
Transitioned to 10-digit dialing (988 lifeline rollout).
Source: Wikipedia
D · Capacity

How full it is

Prefixes assigned
374
Prefixes available
426
Thousands-blocks assigned
996

Prefix-assignment counts describe allocation to carriers, not how many individual numbers are in use. Full technical records: NumberResearch ↗.

Compare 906 with another code →
Sources
Wikipedia ↗
Area code 906
NumberResearch.org ↗
Live status, dates, assignment counts and exhaust forecast — data as of 2026-09-18 (CC BY 4.0).

Place, relationships and history above are compiled by North American Numbers from the sources listed and last checked 2026-09-18. A check date is not an expert review — see how this is made. Flag an error.