734 Area Code: Ann Arbor, Michigan

Southeast Michigan outside the immediate Detroit footprint is served by the 734 area code, with Ann Arbor as the primary city. Ann Arbor sits in the rolling country of Washtenaw County, organized around the University of Michigan's main campus, which has shaped the city's economy and population for over a century. The local working economy reflects the university, a substantial research-and-development sector built around the surrounding medical and engineering institutions, and a growing technology and biotech base. The 734 footprint extends through Ypsilanti (Eastern Michigan University), Monroe, the western suburban Detroit corridor, and the surrounding southeast Michigan counties.

Records linked to 734 numbers in the directory often include Detroit, Flint, Grand Rapids, and Kalamazoo — Michigan cities outside the 734 footprint. The pattern reflects standard public-record dynamics, with phone numbers porting across Michigan and addresses linked across multiple cities. The directory currently documents 495 distinct prefixes within 734 in detail, a working subset of the prefix population the code carries.

Ann Arbor's median age is the most striking demographic feature: at roughly the high twenties, the city sits well below the US figure, a pattern driven heavily by the university student population. Median household income runs above the national reading, home values come in well above the US median, and population places Ann Arbor among the larger university-anchored cities in the country — substantial enough to support a regional economy organized around the campus, hospital system, and the surrounding research and technology corridor.