Area code 947 is an overlay for area code 248 in southeastern Michigan, serving Oakland County and surrounding Detroit suburbs like Troy, Farmington Hills, Southfield, and Pontiac. It was introduced in 2002 to accommodate the growing demand for new phone numbers in one of Michigan’s most populous regions. The overlay requires ten-digit dialing and ensures that new businesses and residents continue to have access to numbering resources. While 248 remains the legacy code, 947 is commonly assigned to mobile phones and VoIP services. The region is known for its corporate headquarters, retail centers, and affluent neighborhoods. Together, 947 and 248 support the economic heartbeat of suburban Detroit.