Michigan · Eastern Time
313 Area Code
The 313 area code is a telephone area code in Michigan, covering Detroit and the surrounding area. It lies in the Eastern Time zone for most of its territory.
Last updated June 5, 2026
Where is the 313 area code?
313 serves Detroit and nearby communities in Michigan. In the wider directory it sits in the Midwest region.
Time zone note: Eastern statewide except four Upper Peninsula counties near Wisconsin (Central).
Dialing 313
Detroit is currently served by the single area code 313. Ten-digit dialing (area code + seven-digit number) always works and is increasingly the norm nationwide; some local calls may still connect with seven digits. If a future overlay is added, 10-digit dialing would become mandatory.
History of the 313 area code
313 is one of the original area codes assigned in 1947, when AT&T and Bell Laboratories created the North American Numbering Plan and divided the country into the first 86 numbering plan areas. It has served the Detroit area ever since.
Is 313 a scam or spam risk?
313 is a legitimate geographic area code, not a premium or toll line, so a call from it costs you nothing extra. That said, scammers frequently spoof real local area codes to look familiar on caller ID. A genuine 313 number on your screen is no guarantee the caller is local or trustworthy. See spam & scam-risk area codes for how spoofing works and how to respond.
Other Michigan area codes
Explore more
See every code in Michigan, compare codes across the Midwest region, or view all Eastern Time codes. You can also browse the 3XX block or the complete numeric list of US area codes.
New to how this all works? Start with how area codes work, then read up on overlays, 10-digit dialing, and spam & scam-risk codes. To check another number, use the area code lookup tool.
Quick answers
313 area code FAQ
Where is the 313 area code?
The 313 area code is in Michigan, serving Detroit and the surrounding area in the Midwest region.
What time zone is 313 in?
313 is in the Eastern Time zone. Eastern statewide except four Upper Peninsula counties near Wisconsin (Central).
Do I have to dial 10 digits for 313?
Ten-digit dialing always works, and many areas now require it; some local calls in this area may still connect with seven digits.
Is 313 a toll-free or premium code?
No. 313 is a standard geographic area code, so calling it costs the same as any local or long-distance call on your plan. Toll-free calls use 800, 888, 877, 866, 855, 844 or 833.