Area Code 313: Detroit, Michigan
313 is a telephone area code serving Michigan, including Detroit. It is part of the North American Numbering Plan and is dialed with the country code +1.
Numbers beginning with 313 are located in Michigan, United States (NANP region: Southeast). The code covers Detroit.
How to Dial Area Code 313
| Calling from | What to dial |
|---|---|
| Anywhere in the US or Canada | 1 313 XXX-XXXX (10-digit dialing: 313 + 7-digit number) |
| Local call inside the same area code | 7-digit number in most areas; 10 digits where an overlay code is active |
| From the UK or Europe | 00 1 313 XXX XXXX |
| From Australia | 0011 1 313 XXX XXXX |
| From a mobile phone anywhere | +1 313 XXX XXXX |
Whatever country you are calling from, the + symbol replaces the exit code. Save the contact as +1 313 XXXXXXX and it will dial correctly from any phone in the world.
Time Zone for Area Code 313
Calls to a 313 number ring in the America/Detroit time zone, standard offset UTC-05:00. Daylight saving time applies here, so the offset moves forward one hour from March to November.
Note: the four Upper Peninsula counties bordering Wisconsin use Central time, one hour behind.
Cities and Communities Served by 313
The following places fall inside the 313 calling area:
Other Area Codes in Michigan
These codes also serve Michigan. Area codes are assigned by the North American Numbering Plan Administration (NANPA).
| Area Code | Cities / Coverage |
|---|---|
| 231 | Muskegon, Traverse City |
| 248 | Troy, Pontiac |
| 269 | Kalamazoo, Battle Creek |
| 517 | Lansing, Jackson |
| 586 | Warren, Sterling Heights |
| 616 | Grand Rapids |
| 734 | Ann Arbor |
| 810 | Flint |
| 906 | Upper Peninsula |
| 947 | Oakland County (overlay) |
| 989 | Saginaw, Midland |
See all 12 area codes in Michigan →
Frequently Asked Questions
Where is area code 313?
Area code 313 is in Michigan, United States. It covers Detroit.
What time zone is area code 313 in?
Area code 313 rings in the America/Detroit time zone (UTC-05:00 standard).
Do I need to dial 1 before area code 313?
Yes, for a long-distance call inside the US and Canada you dial 1 first, then 313, then the seven-digit number. The 1 is the North American long-distance trunk prefix — it is not the country code. From outside North America you dial your exit code then 1 then 313.
Is area code 313 toll-free?
No. 313 is a standard geographic area code, so normal long-distance rates apply unless your plan includes them. Toll-free NANP codes are 800, 833, 844, 855, 866, 877 and 888.