248 Area Code: Michigan's Oakland County — Cities, Time Zone & Guide

Area code 248 covers Oakland County, Michigan — the suburban county immediately north of Detroit and one of the wealthiest counties in the United States. Created in 1997 as a split from the original 810 area code, the 248 area code serves a prosperous region of automotive industry headquarters, tech companies, upscale residential communities, and thriving commercial corridors north of Detroit.

Oakland County's economy is anchored by the automotive industry — General Motors, FCA (Stellantis), and dozens of tier-1 automotive suppliers have headquarters or major facilities in the 248 area. The county has also diversified significantly into technology, healthcare, and professional services. This guide covers the 248 area code cities, the 947 overlay, Michigan time zone, and how to get a 248 number.

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Area code 248 covers Oakland County in Southeastern Michigan. Oakland County is bordered by Macomb County to the east, Wayne County (Detroit) to the south, Washtenaw County to the southwest, Livingston County to the west, and Genesee/Lapeer Counties to the north.

Major cities and communities in the 248/947 area code territory include:

• Troy — Oakland County's largest city; home to numerous automotive and tech company headquarters
• Pontiac — county seat of Oakland County; historically automotive manufacturing
• Auburn Hills — headquarters of Stellantis (formerly FCA) North America; home to Palace of Auburn Hills
• Southfield — major commercial and office hub on Oakland/Wayne County border
• Royal Oak — dense, walkable city known for arts, dining, and nightlife
• Birmingham — upscale city known for luxury retail and dining
• Bloomfield Hills — one of the wealthiest cities in the US per capita
• Farmington Hills — large suburban city with significant corporate presence
• Waterford Township — large township on the western edge of the county
• West Bloomfield Township — affluent township with significant Jewish community
• Rochester Hills — home to Oakland University

Area code 248 is in the Eastern Time Zone: Eastern Standard Time (EST, UTC−5) in winter and Eastern Daylight Time (EDT, UTC−4) in summer. Michigan observes Daylight Saving Time. Oakland County — like all of the Detroit metropolitan area — runs on Eastern Time.

Note: Most of Michigan's Upper Peninsula is in the Central Time Zone, but all of the Lower Peninsula including Oakland County uses Eastern Time. The 248 area code is entirely Eastern Time.

Detroit-area businesses in the 248 area code operate on standard Eastern business hours (9:00 AM – 5:00 PM ET). The automotive industry, which dominates the regional economy, follows global schedules with suppliers and engineering partners in Europe and Asia, making the time zone awareness critical for cross-timezone automotive business communications.

Area code 947 is an overlay for the 248 area code, introduced in 2013 to address the growing demand for new telephone numbers in Oakland County. Both codes cover the same geographic territory. New phone numbers assigned in Oakland County after 2013 receive 947 by default; existing 248 numbers remain unchanged.

The introduction of 947 required mandatory 10-digit dialing within Oakland County — callers must include the area code even when calling other local 248 or 947 numbers. This was a change from the prior 7-digit local dialing convention.

For businesses choosing between a 248 and 947 number: 248 has over 25 years of Oakland County association and greater brand recognition. 947 numbers are equally local and often more available. Both signal Oakland County, Michigan to callers and are treated identically for routing purposes.

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Oakland County is consistently ranked among the top US counties by household income and economic output. The county's GDP is driven by several major sectors:

Automotive Industry

General Motors' global headquarters is in Detroit's adjacent Renaissance Center, but dozens of GM divisions, design studios, and supplier operations are in Oakland County. Stellantis (formerly FCA) North American headquarters is in Auburn Hills. The Big Three automotive companies and hundreds of tier-1 and tier-2 automotive suppliers create a dense economic ecosystem throughout the 248 area code.

Technology and Professional Services

Troy and Southfield host significant technology company offices and professional services firms. The 248 area has attracted IT, consulting, financial services, and healthcare companies as the regional economy diversified beyond automotive dependence.

Retail and Real Estate

Oakland County contains some of Michigan's premier retail destinations, including Somerset Collection in Troy (one of the highest-grossing malls in the US). The residential real estate market in Bloomfield Hills, Birmingham, and West Bloomfield ranks among the most expensive in the Midwest.

Businesses outside Michigan can provision a 248 area code virtual phone number through a cloud phone platform. A 248 virtual number signals Oakland County, Michigan presence to callers — increasing answer rates from local numbers and establishing credibility with Detroit-area contacts.

Businesses that benefit from 248 virtual numbers include: automotive suppliers and vendors targeting Detroit-area OEMs, professional services firms pitching to Troy and Southfield corporate clients, real estate agents serving the Oakland County market, and any company participating in Detroit-area trade shows, automotive shows, or conventions.

MeraTalk supports 248 and 947 area code number provisioning with voice and SMS capability. Numbers activate in minutes. Search available 248 Michigan numbers at meratalk.com.

In an era of national toll-free lines and app-based calling, a local Oakland County number continues to pull real weight. Callers screen unfamiliar numbers aggressively, and a familiar 248 prefix on the caller ID reads as a neighbor, a nearby supplier, or a local service — not a distant call center. For companies selling into the Detroit northern suburbs, that first impression often decides whether the phone gets answered at all.

Local digits also matter after the call connects. Automotive suppliers courting Troy and Auburn Hills purchasing teams, real estate agents working Birmingham and Bloomfield Hills listings, and contractors serving Rochester Hills homeowners all benefit from looking rooted in the county they serve. A local number on a website, vehicle wrap, or yard sign quietly reinforces that the business is part of the community rather than passing through it — a signal no toll-free line can replicate. For more, see 248 area code.

US number portability rules mean an established Oakland County business never has to abandon digits it has spent years promoting. A 248 or 947 number can move between carriers — from a legacy landline to a cloud platform, or between VoIP providers — while staying exactly the same for everyone who dials it.

• Do not cancel the existing service first; the number must be active for the port to succeed
• Match the account details on the port request to the current bill — name, account number, and service address
• Sign a Letter of Authorization so the new provider can execute the transfer
• Plan around a brief cutover window; inbound calls continue on the old carrier until completion

Porting works in the other direction too — a number provisioned on one cloud platform can later move elsewhere, which keeps providers competing on service rather than lock-in.

Affluent suburban counties are a favorite target for phone fraud, and caller-ID spoofing lets scammers display a local suburban Detroit number they do not actually control. The displayed digits prove nothing — what matters is what the caller asks for.

• Fake warranty and vehicle-service renewal calls, a common lure in an automotive-industry region
• IRS, Social Security, or court-summons impersonations demanding immediate payment
• Utility disconnection threats requiring gift cards or wire transfers within the hour
• Grandparent scams claiming a family member urgently needs bail or medical money

Legitimate organizations do not demand payment by gift card, and none will object to being called back on their published number. Households and front-desk staff alike should hang up on pressure tactics, verify independently, and report persistent robocalls to the FCC or FTC.

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