Area codes in Dearborn, Michigan
Dearborn, Michigan uses 2 area codes — 313 and 679. The main Dearborn area code is 313.
Area codes serving Dearborn
Phone numbers in Dearborn are written as ten digits — for example (313) 555-0190 — and fall in the Eastern Time zone.
How Dearborn came to have 2 area codes
The original Dearborn area code is 313, in service since 1947. As the area ran low on available numbers, an overlay code was added over the same region for new phone lines: 679 (2025). Existing numbers kept their original code — an overlay never forces anyone to change their number — which is why Dearborn now uses all 2 codes and every local call is dialed with ten digits.
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Frequently asked questions
What is the area code for Dearborn?
The main area code for Dearborn, Michigan is 313. Dearborn is now served by 2 area codes in total: 313, 679.
How many area codes does Dearborn have?
Dearborn has 2 area codes: 313, 679.
Why does Dearborn have more than one area code?
As Dearborn used up the numbers available in its original area code (313, in service since 1947), additional "overlay" codes were added over the same area so new phone numbers could keep being assigned.
How do you dial a Dearborn number?
Dial all 10 digits — the area code (313 or 679) followed by the 7-digit local number. From abroad, dial +1, then the area code and number.
Sourced from the official NANPA (North American Numbering Plan Administrator) numbering database, current as of August 2, 2026. Refreshed monthly.