Area code 313

Area code 313 at a glance

Area code 313 is a geographic area code in Michigan, in service since January 1, 1947, according to the North American Numbering Plan Administrator (NANPA). It is an overlay: 313 and 679 cover the same territory, so neighbors on the same street can have different area codes. It is in the Eastern time zone.

Cities and towns in area code 313

313 holds 11% of the 6,882 central office codes assigned in Michigan, the 2nd most of the state's 13 codes. None of its rate centers could be matched to a Census place name. Each place page lists the exact prefixes and carriers for that town.

How calls are dialed in 313

According to NANPA's dialing-plan data, local calls within 313 are dialed as ten digits (area code plus number) and toll calls as 1 plus ten digits. Because local calls need the area code, business cards, signage and website copy should always show the full ten-digit number. NANPA's dialing-plan note for this code reads: "1+10 digit permissible at each service provider’s discretion."

Carriers with 313 numbers

35 carriers hold the 769 central office codes assigned in 313. Michigan Bell Tel CO has the most, with 244 (32%). 485 of the codes (63%) are pooled, meaning the code holder shares blocks of 1,000 numbers with other carriers instead of using all 10,000 itself. The code holder is not necessarily the carrier serving a given number today, since numbers can be ported between providers.

Where 313 numbers are rated

NANPA assigns each central office code to a rate center, the local calling area that decides whether a call is local or toll. 313 has codes in 6 rate centers. Rate center names in the file are abbreviations; where one matches a Census place, the table links to that city's local-number page.

How full is area code 313?

An area code has 800 possible central office codes that start with 2 through 9, a few of which are reserved (such as N11 service codes and 555). 769 are assigned in 313, 96% of 800. 91 were assigned in 2020 or later.

Getting a 313 number for your business

Callata is a business phone system priced at $99 a month with 5 users included, then $20 per additional user. Callata Office includes up to 3 local business numbers, unlimited inbound calling, 1,500 pooled outbound US and Canada minutes per user each month, a browser softphone that can also ring your cell, voicemail with transcription, call recording with AI summaries, business-hours routing and E911 on every number.

Porting a number you already use in area code 313 is free, and business texting is available once the carrier registration (10DLC) is approved; the registration carries a one-time $49 fee. Which specific numbers are open in a given area code depends on carrier inventory at the time you sign up.

AI agents are optional: an AI receptionist or scheduler can pick up when the team is busy or closed, take a message, send a text or email, or transfer the call. They draw on prepaid AI minutes ($0.25/minute), disclose that they are AI, and outbound AI calls require prior consent and are limited to 8am–9pm.