Michigan · Eastern Time
947 Area Code
Area code 947 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 248, so 10-digit dialing is required.
Last updated October 1, 2026 · Source: NANPA
Where is the 947 area code?
947 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 947 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 947
Oakland County.
Time zone note: Eastern statewide except four Upper Peninsula counties near Wisconsin (Central).
947 overlay codes and dialing
The 947 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 947 area code
947 went into service on September 7, 2002 as an overlay of 248, relieving number exhaustion in the Troy area. Rather than splitting the region, the overlay lets existing customers keep their numbers while new lines draw from the added code. Learn more in our overlay guide.
Is 947 a scam or spam risk?
947 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 947 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 9XX 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
947 area code FAQ
Where is the 947 area code?
The 947 area code is in Michigan, covering Oakland County suburbs north and northwest of Detroit, in the Midwest region.
What cities are in the 947 area code?
Cities in the 947 area code include Troy, Farmington Hills, Southfield, Rochester Hills, Novi, Royal Oak, Pontiac, Auburn Hills, Birmingham and Ferndale.
What time zone is 947 in?
947 is in the Eastern Time zone. Eastern statewide except four Upper Peninsula counties near Wisconsin (Central).
What is the overlay for the 947 area code?
947 shares its territory with 248. Both codes (248, 947) serve the same area, so 10-digit dialing is required for every call.
When did the 947 area code start?
947 went into service on September 7, 2002 as an overlay of 248.
Do I have to dial 10 digits for 947?
Yes. Because 947 is an overlay area, you must dial the full 10-digit number (area code + 7 digits) for every call.
Is 947 a toll-free or premium code?
No. 947 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.