Ann Arbor, MI is currently using one area code which is area code 734. Area code 734 was created from a split of area code 313 and put into service on December 13, 1997.
In addition to Ann Arbor, MI area code 734 serves an area in southeastern Michigan that includes Monroe and Washtenaw Counties, and the southwestern portions of Wayne County including the larger communities of Ann Arbor, Belleville, Canton, Garden City, Livonia, Monroe, Plymouth Township, Romulus, Saline, Southgate, Westland, Wyandotte, and Ypsilanti, along with many smaller communities.
Ann Arbor, MI is located in Washtenaw County and observes the Eastern Time Zone. View our Times by Area Code tool.