Michigan · Eastern Time
248 Area Code
Area code 248 is in Michigan, serving Oakland County suburbs north and northwest of Detroit. It is in the Eastern Time zone. It shares its territory with overlay code 947, so 10-digit dialing is required.
Last updated October 1, 2026 · Source: NANPA
Where is the 248 area code?
248 is a Michigan area code covering Oakland County suburbs north and northwest of Detroit. In the wider directory it sits in the Midwest region.
Cities in the 248 area code
- Troy
- Farmington Hills
- Southfield
- Rochester Hills
- Novi
- Royal Oak
- Pontiac
- Auburn Hills
- Birmingham
- Ferndale
- Madison Heights
- Bloomfield Hills
- West Bloomfield
- Waterford
Counties served by 248
Oakland County.
Time zone note: Eastern statewide except four Upper Peninsula counties near Wisconsin (Central).
248 overlay codes and dialing
The 248 territory is covered by an overlay of 2 area codes: 248, 947. All of them serve the same geographic area, and the original code is 248. Because more than one code covers the same ground, 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.
History of the 248 area code
248 went into service on May 10, 1997, created when it was split from 810. It serves Troy and the surrounding part of Michigan, and today shares its territory with overlay code 947. For how codes are created, split, and overlaid, see how area codes work.
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 in Troy, MI 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, covering Oakland County suburbs north and northwest of Detroit, in the Midwest region.
What cities are in the 248 area code?
Cities in the 248 area code include Troy, Farmington Hills, Southfield, Rochester Hills, Novi, Royal Oak, Pontiac, Auburn Hills, Birmingham and Ferndale.
What time zone is 248 in?
248 is in the Eastern Time zone. Eastern statewide except four Upper Peninsula counties near Wisconsin (Central).
What is the overlay for the 248 area code?
248 shares its territory with 947. Both codes (248, 947) serve the same area, so 10-digit dialing is required for every call.
When did the 248 area code start?
248 went into service on May 10, 1997.
Do I have to dial 10 digits for 248?
Yes. Because 248 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.