Detroit, MI Area Codes

Area codes serving Detroit

Detroit sits in Michigan, part of the Midwest region and the Eastern Time zone. Its numbers are spread across an overlay of 2 codes that all cover the same ground: 313, 679.

The original code is 313 (in service since 1947). As the area ran low on numbers, regulators added overlay codes on top instead of splitting the city, so longtime residents kept their numbers while new lines received a newer code.

Code	Area served	In service
313	City of Detroit and nearby Wayne County communities	January 1, 1947
679	City of Detroit and nearby Wayne County communities	November 7, 2025

Nearby cities sharing these area codes

• Dearborn
• Dearborn Heights
• Hamtramck
• Highland Park
• Inkster
• Grosse Pointe
• Grosse Pointe Woods
• Grosse Pointe Park
• Harper Woods

How to pick an area code for a new number

When you activate a new line in Detroit, the carrier assigns whichever code has numbers available — you usually can't choose. If a specific code matters to you (for example the prestige of 313), ask the carrier whether any blocks remain, or request a number transfer. All codes here dial identically and cost the same.

Dialing in Detroit

Because Detroit is an overlay area, 10-digit dialing is mandatory: always dial the area code plus the seven-digit number, even for a neighbor. See 10-digit dialing and overlay area codes for the background. For every code in Michigan, visit the Michigan area codes page.