Dearborn, Michigan

Where Is Area Code 313?

Area code 313 is in southeastern Michigan. It serves the Detroit area, including the city of Detroit and nearby communities in Wayne County. Dearborn uses area code 313, along with several other inner-ring suburbs next to Detroit.

Area code 313 covers Detroit, Dearborn, Hamtramck, Highland Park, and parts of neighboring communities. The area sits along the Detroit River, across from Windsor, Ontario, Canada. Wayne County is the main county associated with area code 313.

Notable places in the 313 region include downtown Detroit, the Detroit River waterfront, and major road corridors such as Interstate 94 and Interstate 75. In Dearborn, the Henry Ford Museum of American Innovation and Greenfield Village are major landmarks. The University of Michigan-Dearborn is also in Dearborn.

History of Area Code 313

Area code 313 is one of the original North American area codes created in 1947. It originally covered a much larger part of southeastern Michigan before later splits reduced its size. The code has long been tied to Detroit and the growth of telephone service in the region.

Area code 313 was split several times as demand for phone numbers grew. Area code 810 split from 313 in 1993, and area code 734 split from 313 in 1997. In 2025, area code 679 was approved as an overlay for the same geographic area as 313, with mandatory 10-digit dialing scheduled to begin before new 679 numbers are assigned.

Key Facts About Area Code 313

• Area code 313 is in the state of Michigan.
• Detroit is the main city associated with area code 313.
• Dearborn, Hamtramck, and Highland Park are among the cities that use area code 313.
• Area code 313 is in the Eastern Time Zone.
• Area code 313 was one of the original area codes established in 1947.
• Area code 313 now serves a smaller part of Wayne County after major splits in 1993 and 1997.
• The Henry Ford Museum of American Innovation in Dearborn is located within the 313 area.
• Area code 679 was approved as an overlay to 313, adding new numbers in the same service area.

Frequently Asked Questions

What state is area code 313 in?

Area code 313 is in Michigan.

What major cities use area code 313?

Major cities that use area code 313 include Detroit, Dearborn, Hamtramck, and Highland Park.

Is area code 313 a toll-free number?

No. Area code 313 is a geographic area code for part of southeastern Michigan.