The area code 734 is located in Ann Arbor, Michigan.
Area code 734 serves southeast Michigan, centering on Ann Arbor and stretching across all of Washtenaw County, all of Monroe County, and parts of western and southern Wayne County. This local area code connects a region known for research, education, industry, and easy access to Detroit. It was introduced in 1997 after a split from 313, giving communities west and south of Detroit their own distinct number identity. Ann Arbor, home to the University of Michigan and the Huron River, anchors the region with a strong tech and arts scene. The area runs on Eastern Time (ET) and uses the North American Numbering Plan for seamless calling across the U.S. and Canada.
Key cities and communities in area code 734 include:
The 734 area covers major landmarks like Michigan Stadium (“The Big House”) in Ann Arbor and the Detroit Metropolitan Wayne County Airport (DTW) in Romulus. Farther south, Monroe County reaches the Lake Erie shoreline, adding outdoor recreation and waterfront views to the mix. Businesses, schools, and hospitals across the region commonly use 734 phone numbers, so seeing this code often means a call from southeast Michigan. For international calls, use the format +1 734 followed by the local number. This makes 734 a clear signal you’re connecting with the Ann Arbor–Monroe–Western Wayne corridor.
“Year introduced: 1997 (split from 313)” — North American Numbering Plan Administrator (NANPA)