313 area code
Detroit area, Eastern Time.Area code 313 covers Detroit in Michigan, on Eastern Time. 679 covers the same area.
Right now in Detroit
Eastern Time (EST, UTC-5; EDT, UTC-4 in summer)
Calling hours: Every day, 9 AM to 9 PM (Michigan law)
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Where 313 numbers come from
Numbers are issued by rate center, a billing area named for its main town. 313 has 1. Each one's share is how many 313 numbers start there. Its biggest metro area is Detroit-Warren-Dearborn, MI.
- Detroit100%
Share of exchanges (blocks of 10,000 numbers). Source: NANPA rate center and exchange reports, November 10, 2026
When can you call a 313 number?
Sales calls to homes and cell phones have legal hours, set by Michigan law. Hold every 313 number to them, since you can't tell a work line from a personal cell.
What applies to 313Every day, 9 AM to 9 PM
- Federal (TCPA and FTC rule)Every day, 8 AM to 9 PMCalls to residential and mobile numbers. Most calls to businesses are exempt from the FTC's rule.47 CFR 64.1200(c)(1); 16 CFR 310.4(c) (opens in a new tab)
- Michigan lawEvery day, 9 AM to 9 PMIn a harassment statute that needs intent to annoy.MCL 750.540e(1)(f) (opens in a new tab)
Local time comes from the area code, not from where the person is today. Mobiles keep their number when they move. Calling hours here are a guide, not legal advice. Every state's calling hours, with sources
313 and 679
313 is one of the original area codes from 1947, and 734 and 810 were later split off from it. 313 and 679 cover the same area, so new numbers can get either code and neighbors can have different area codes. 313 holds 100% of the area's exchanges; 679 holds the rest. Local calls take all 10 digits.
- 1947313 starts
- 1993810 split off
- 1997734 split off
- 2025679 overlay
Source: NANPA area code database
Calling a list of 313 numbers?
Paste it into the free phone number validator. It checks every number, finds each one's time zone and sorts the list by who you can call right now.
313 area code FAQ
What area code is 313?
313 is a Michigan area code for Detroit.
What time zone is the 313 area code in?
Eastern Time (EST, UTC-5; EDT, UTC-4 in summer).
Is 679 the same as 313?
Same area, different code. 313 and 679 cover the same area (an overlay), so new numbers can get any of them and local calls take all 10 digits.
What are the calling hours for 313 numbers?
Every day, 9 AM to 9 PM, local time, under Michigan law.
When did the 313 area code start?
In 1947: it's one of the original area codes.
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