Area Code Atlas

NANP - Overlay of 810 Numbering Plan Area (NPA) with 586 NPA - Michigan

Suspension of Code Assignments in the 586 NPA Michigan

810 NPA Split, Creating 586 NPA (Michigan)

NPA 586 split from 810

Area code 586 was created in March 2001 by splitting from area code 810 to serve Macomb County, including Mt. Clemens, Roseville, Warren, and Utica. Wireless central office codes in rate centers moving to the new NPA were permanently grandfathered.

810 / 586 NPA Split - Wireless NXX Grandfathering (Michigan)

810 / 586 NPA Split (Michigan) - Wireless NXX Grandfathering

NPA 586 split from 810

Area code 586 was created on September 22, 2001, as a split from area code 810, serving most of Macomb County, Michigan. The split was implemented after an initial proposal to overlay 586 on 810 was rejected due to opposition to ten-digit dialing.

Mandatory dialing for NPA 586 and 810

Permissive dialing for area code 810 continued until March 23, 2002, after which mandatory dialing of the new area code 586 was required for calls within its territory.