Area codes in Troy, Michigan
Troy, Michigan uses 2 area codes — 248 and 947. The main Troy area code is 248.
Area codes serving Troy
Phone numbers in Troy are written as ten digits — for example (248) 555-0190 — and fall in the Eastern Time zone.
How Troy came to have 2 area codes
The original Troy area code is 248, in service since 1997. As the area ran low on available numbers, an overlay code was added over the same region for new phone lines: 947 (2002). Existing numbers kept their original code — an overlay never forces anyone to change their number — which is why Troy now uses all 2 codes and every local call is dialed with ten digits.
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Nearby cities
- Warren area codes
- Southfield area codes
- Pontiac area codes
- Detroit area codes
- Dearborn area codes
- Livonia area codes
- Windsor area codes
- Lincoln Park area codes
More cities in Michigan
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- Kalamazoo area codes
Frequently asked questions
What is the area code for Troy?
The main area code for Troy, Michigan is 248. Troy is now served by 2 area codes in total: 248, 947.
How many area codes does Troy have?
Troy has 2 area codes: 248, 947.
Why does Troy have more than one area code?
As Troy used up the numbers available in its original area code (248, in service since 1997), additional "overlay" codes were added over the same area so new phone numbers could keep being assigned.
How do you dial a Troy number?
Dial all 10 digits — the area code (248 or 947) 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.