Michigan · Eastern Time
248 Area Code
The 248 area code is a telephone area code in Michigan, covering Troy and the surrounding area. It lies in the Eastern Time zone for most of its territory.
Last updated June 5, 2026
Where is the 248 area code?
248 serves Troy 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).
Overlay codes serving Troy
Troy is served by an overlay of 2 area codes: 248, 947. Because more than one code covers the same area, 10-digit dialing is mandatory — you must dial the area code for every local call. New phone lines may be assigned any of these codes, so Troy numbers are no longer tied to a single prefix.
History of the 248 area code
248 was introduced as an overlay to relieve number exhaustion in the Troy area, adding capacity on top of 248 rather than splitting the region. Overlays let existing customers keep their numbers while new lines draw from the added code. Learn more in our overlay guide.
Is 248 a scam or spam risk?
248 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 248 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 2XX 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
248 area code FAQ
Where is the 248 area code?
The 248 area code is in Michigan, serving Troy and the surrounding area in the Midwest region.
What time zone is 248 in?
248 is in the Eastern Time zone. Eastern statewide except four Upper Peninsula counties near Wisconsin (Central).
Do I have to dial 10 digits for 248?
Yes. Because Troy is an overlay area, you must dial the full 10-digit number (area code + 7 digits) for every call.
Is 248 a toll-free or premium code?
No. 248 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.