CallataGuidesArea code 679
Where 679 is, how it is dialed, which carriers hold its numbers and how many of its codes are in use, from NANPA's 10/01/2026 files.
- State
- MI
- In service
- 2025
- Assigned codes
- 0of 800 possible
- Carriers
- 0
About area code 679
679 is one of 13 geographic area codes serving Michigan; NANPA records its in-service date as November 7, 2025. It is an overlay: 679 and 313 cover the same territory, so neighbors on the same street can have different area codes. It is in the Eastern time zone.
| Item | Value |
|---|---|
| State | Michigan |
| In service since | November 7, 2025 |
| Assigned by NANPA | September 2, 1999 |
| Overlay | Yes, with 313 |
| Parent area code (NANPA) | 313 |
| Time zone | Eastern |
| Local calls within the code | ten digits (area code plus number) |
| Assigned central office codes | 0 |
| Rate centers with codes | 0 |
| Carriers holding codes | 0 |
| Pooled codes | 0 |
| Codes assigned since 2020 | 0 |
| Relief planning in progress | No |
Source: NANPA NPA report and utilized central office code file, both dated 10/01/2026.
Dialing 679 numbers
According to NANPA's dialing-plan data, local calls within 679 are dialed as ten digits (area code plus number) and toll calls as 1 plus ten digits. Ten-digit local dialing means the area code is part of how customers save and recognize your number, so print it in full everywhere. NANPA's dialing-plan note for this code reads: "1+10 digit dialing permissible at service provider discretion"
A new code in an overlay
NANPA's utilized-code file dated 10/01/2026 lists no central office codes assigned in 679 yet. NANPA assigned the code on September 2, 1999 and put it in service on November 7, 2025. In an overlay, numbers for the shared territory keep coming from the older code (313) until carriers start drawing codes from 679, so a business phone number requested here today will most likely carry 313.
313 has been in service since January 1, 1947 and has 769 assigned codes held by 35 carriers across 6 rate centers. Its largest code holders are Michigan Bell Tel CO (244), Omnipoint Communications Midwest Operations, LLC (141), and New Cingular Wireless PCS, LLC - Il (95).
An overlay leaves existing numbers unchanged and adds a second code for new numbers in the same territory. Local calls there need all ten digits, so businesses should print their full number everywhere.
| Area code | In service since | Assigned codes | Carriers |
|---|---|---|---|
| 679 | November 7, 2025 | 0 | 0 |
| 313 | January 1, 1947 | 769 | 35 |
Source: NANPA NPA report and utilized code file dated 10/01/2026.
A local 679 number on Callata
Callata Office costs $99 per month for up to 5 people, and each additional user is $20 a month. That covers up to 3 local numbers, calling from a browser or your cell, transcribed voicemail, recorded calls with AI summaries, after-hours routing and E911 on each number.
If you already have a number in area code 679, porting it to Callata is free. Texting from a local number requires a one-time carrier registration (10DLC, $49), and the numbers available in any area code depend on carrier inventory when you choose them.
Optional AI agents (receptionist, sales, support or scheduler) can answer calls after hours or when nobody picks up, take messages, text, email and transfer to your team. They are billed from prepaid AI minutes at $0.25 per minute, identify themselves as AI, and may only place outbound calls to people who consented, between 8am and 9pm.
Frequently asked questions
Where is area code 679?
679 is a geographic area code in Michigan.
What time zone is area code 679 in?
NANPA lists 679 in the Eastern time zone.
When did area code 679 go into service?
NANPA records an in-service date of November 7, 2025. The code was assigned on September 2, 1999.
Is 679 an overlay area code?
Yes. It shares its territory with 313.
Will businesses in the 679 area have to change their numbers?
No. An overlay adds a new code for new numbers in the same territory; existing 313 numbers stay as they are. Local calls need ten digits.
Can my business get a 679 phone number?
Callata includes up to 3 local numbers on its $99/month plan (5 users included). Which 679 numbers are open depends on carrier inventory when you choose, and you can port an existing number for free.