Area Code Atlas

NPA 734 split from 313

Area code 734 was created in 1997 as a geographic split from area code 313, serving southeast Michigan including Washtenaw and Monroe counties and parts of Wayne County.

NPA 734 split from 313

Area code 734 was created in May 1997 by splitting from area code 313. The new code serves Washtenaw and Monroe counties and parts of Wayne County in southeast Michigan, including Ann Arbor and surrounding communities.

NPA 734 split from 313

On December 13, 1997, area code 734 was created in a split from 313. The western portion of the 313 area, including Ann Arbor, Monroe County, and western and downriver Wayne County, was assigned to 734.

Suspension of Relief in the 248, 313 and 734 NPAs (Michigan)

NPA 734 projected exhaust in 2040

A projection made in October 2025 estimated that area code 734 will exhaust its available numbers in the first quarter of 2040, according to the North American Numbering Plan Administrator.