The 248 area code is a geographic telephone prefix assigned to Oakland County in southeastern Michigan under the North American Numbering Plan, serving the Metro Detroit suburbs north of the city — including Troy, Farmington Hills, Southfield, Rochester Hills, Pontiac, Royal Oak, West Bloomfield, and Bloomfield Hills — along with portions of Wayne County such as Livonia and Northville. Oakland County records the highest GDP of any county in Michigan at roughly $127 billion, driven by more than 120 automotive manufacturers and suppliers headquartered or operating there, alongside a diversified base of healthcare, financial services, technology, and professional consulting firms.
Michigan's original area code, 313, was assigned in 1947 to cover the entire southeastern corner of the state. In December 1993, area code 810 split off from 313 to take over the outer suburban ring including Oakland, Macomb, Genesee, and Lapeer counties. Oakland County's booming corporate economy exhausted even 810's capacity within a few years, and on May 10, 1997, area code 248 was created in a further split from 810, becoming the exclusive prefix for Oakland County. By 2002, growing demand pushed regulators to introduce an overlay rather than another split: area code 947 went into full service on September 7, 2002, sharing the same footprint as 248 and making 10-digit dialing mandatory across the region.
The 248 area code is entirely legitimate, but its affluence makes it a frequent target for neighbor-spoofing scams, with mortgage and financial fraud disproportionately overrepresented — likely because the area's high home values make refinancing pitches feel more plausible to recipients. Other common scam types include health insurance fraud, Medicare/Medicaid impersonation, auto warranty robocalls, and credit card debt relief scams. Anyone contacted this way should avoid sharing financial details and report suspicious calls to the FTC.
For businesses targeting Oakland County's corporate market or Metro Detroit's broader economy, a 248 local number signals embeddedness in one of the country's most automotive-concentrated regions and consistently outperforms toll-free or out-of-state numbers in answer rates. With a modern VoIP or cloud communications provider, a 248 number can be provisioned in minutes and routed to any device or team member regardless of physical location, with no Michigan office required.