Troy, MI Area Codes

Area codes serving Troy

Troy sits in Michigan, part of the Midwest region and the Eastern Time zone. Its numbers are spread across an overlay of 2 codes that all cover the same ground: 248, 947.

The original code is 248 (in service since 1997). As the area ran low on numbers, regulators added overlay codes on top instead of splitting the city, so longtime residents kept their numbers while new lines received a newer code.

Code	Area served	In service
248	Oakland County suburbs north and northwest of Detroit	May 10, 1997
947	Oakland County suburbs north and northwest of Detroit	September 7, 2002

Nearby cities sharing these area codes

• Farmington Hills
• Southfield
• Rochester Hills
• Novi
• Royal Oak
• Pontiac
• Auburn Hills
• Birmingham
• Ferndale
• Madison Heights
• Bloomfield Hills
• West Bloomfield
• Waterford

How to pick an area code for a new number

When you activate a new line in Troy, the carrier assigns whichever code has numbers available — you usually can't choose. If a specific code matters to you (for example the prestige of 248), ask the carrier whether any blocks remain, or request a number transfer. All codes here dial identically and cost the same.

Dialing in Troy

Because Troy is an overlay area, 10-digit dialing is mandatory: always dial the area code plus the seven-digit number, even for a neighbor. See 10-digit dialing and overlay area codes for the background. For every code in Michigan, visit the Michigan area codes page.