Area Code 660: Coverage, Cities, and More - area-code -

Frequently Asked Questions

Area code 660 covers a significant portion of northwestern and central Missouri, including cities like Sedalia, Kirksville, Marshall, Warrensburg, and Chillicothe. It encompasses a mix of urban and rural communities.
Dial 1 + the 10-digit phone number (1-660-XXX-XXXX) when calling a 660 number from outside the area code but within the North American Numbering Plan (NANP). For international calls, dial the international access code (011 in the US), then 1, and the 10-digit number.
Ten-digit dialing became mandatory for all 660 calls on October 24, 2021, to accommodate the nationwide implementation of 988 as the Suicide Prevention Lifeline. This prevents conflicts with existing seven-digit numbers that start with 988.
Area code 660 was created on October 12, 1997. It was split from area code 816 due to the increasing demand for phone numbers driven by population growth and the rise of cell phones, fax machines, and pagers.
As of September 2022, the projected exhaustion date for area code 660 is the third quarter of 2043. This indicates the effectiveness of the split from 816 in providing long-term numbering capacity.
Area code 660 was originally split from area code 816 in 1997. This split was necessary due to the increased demand for phone numbers within the region.
You must dial the full 10-digit phone number, including the 660 area code, even for local calls within the same city or town. This became mandatory in October 2021.
The NANPA oversees the assignment and management of area codes within the North American Numbering Plan. They ensure the long-term viability of the numbering system and provide resources on their website.
The Federal Communications Commission (FCC) regulates interstate and international communications. They have ultimate authority over telecommunications regulations, including area code rules, and provide information on their website.
The Missouri Public Service Commission (MPSC) regulates public utilities within Missouri, including telecommunications providers. They work with the NANPA and FCC to ensure compliance with regulations.
Area code 660 is located within the Central Time Zone. Be mindful of the time difference when making calls to or from this area code from other time zones.
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