The 313 area code is the iconic phone code of Detroit, Michigan and inner Wayne County. One of the original 1947 codes, it is the historic heart of the Motor City. If a 313 number has appeared on your caller ID, this guide explains where it comes from, how to dial it, and how to stay safe from spoofed calls.
Quick Summary: Area Code 313 at a Glance
| Detail | Information |
|---|---|
| Area Code | 313 |
| State | Michigan (MI) |
| Major Cities | Detroit, Dearborn, Hamtramck, Highland Park |
| Time Zone | Eastern Time (ET) |
| Country Code | +1 (USA) |
| Overlay Codes | None (standalone) |
Geographic Coverage & Major Cities
Area code 313 covers the city of Detroit and the inner ring of Wayne County in southeastern Michigan. As the founding code of the region, it anchors the urban core, while the surrounding suburbs use 734, 248, 947, and 586.
- Detroit – the largest city in Michigan and the historic center of the auto industry
- Dearborn – home of Ford Motor Company
- Hamtramck & Highland Park – enclave cities within Detroit
- Grosse Pointe & River Rouge – inner Wayne County communities
As the original Detroit code, a 313 number is prized as a mark of authentic, long-established roots in the Motor City.
A Brief History of Area Code 313
Area code 313 was one of the original area codes established in 1947 and once covered much of southeastern Michigan. Over the decades it shrank as new codes were added – 810 in 1993, and 248 and 734 in 1997 – leaving 313 with the city of Detroit and inner Wayne County. It has no overlay.
Time Zone & Best Time to Call
Numbers in the 313 area code use Eastern Time (ET). The region observes Daylight Saving Time, shifting from EST (UTC-5) to EDT (UTC-4) between March and November each year.
How to Dial Phone Numbers in Area Code 313
Because 313 has no overlay, both 7-digit and 10-digit local dialing have historically worked, but 10-digit dialing is now the recommended standard across the United States.
Calling within the United States or Canada
- 10-digit dialing: Include the area code – 313-XXX-XXXX.
- 11-digit dialing: You can also dial 1-313-XXX-XXXX; the leading 1 is the NANP country code.
Calling from outside the United States
- Format: [exit code] + 1 + 313 + XXX + XXXX
- From the UK, Europe, or most of Asia/Africa: 00 1 313 XXX XXXX
- From any mobile phone worldwide: +1 313 XXX XXXX
Is Area Code 313 a Scam? Safety & Protection Tips
Area code 313 is a legitimate Michigan area code – a call from it is not fraudulent by default. However, scammers frequently spoof local codes like 313, faking the caller ID so their number appears to come from a trusted local line. Neighbor spoofing, which mimics the first six digits of your own number, is especially common.
Common scam tactics linked to this region
| Scam type | What to watch for |
|---|---|
| Government impersonation | Callers posing as the IRS or SSA threatening arrest or fines |
| Bank & card fraud alerts | Claims of suspicious activity seeking your account details |
| Utility shut-off threats | Fake DTE Energy disconnection demands |
| Package delivery scams | Fake texts or calls about a failed delivery with a bad link |
How to report, block, and look up 313 callers
- Never share personal or financial details with an unexpected caller, however urgent they sound.
- Block the number using your phone’s built-in call-blocking feature or a reputable call-screening app.
- Look up the number with a trusted reverse phone lookup before returning any call.
- Report it to the FTC at reportfraud.ftc.gov and register at DoNotCall.gov.
Nearby & Related Area Codes in Michigan
Area code 313 shares and borders several other Michigan codes:
- 734 – western and southern Wayne County, plus Ann Arbor (see our 734 area code guide)
- 248 & 947 – Oakland County to the north (see our 248 area code guide)
- 586 – Macomb County to the northeast (see our 586 area code guide)
- 810 & 679 – Flint and the Thumb to the north (see our 810 area code guide)
Explore more codes across the state on our Michigan area codes hub, or browse every prefix in our US area codes directory.
↑ See the complete list of All US Area Codes by State – every area code across all 50 states in one directory.
Explore Neighboring States
Researching area codes just across the state line? Start with these codes in the states that border Michigan:
Frequently Asked Questions About Area Code 313
Where is the 313 area code located?
Area code 313 covers Detroit and inner Wayne County, Michigan, including Dearborn, Hamtramck, and Highland Park. It operates on Eastern Time.
Does the 313 area code have an overlay?
No. Area code 313 currently covers the Detroit core on a single area code, while the suburbs use 734, 248, 947, and 586.
Is 313 a landline or cell phone area code?
Both. Area code 313 serves landlines, mobile phones, and VoIP numbers throughout Detroit.
Should I answer a call from an unknown 313 number?
If you are not expecting the call, let it go to voicemail. Legitimate callers leave a message, while spoofed or robocall numbers usually will not. Verify any unfamiliar number with a reverse lookup before calling back.
Related 313 Guides
- Is a 313 call safe? Read Is area code 313 a scam? Spam & safety guide.
- Local coverage: see the Detroit area code guide.
- Worried about spam or robocalls? Browse our Scam Alerts directory.