Marshall, Missouri
Area code 660
Where Is Area Code 660?
Area code 660 is in Missouri. It serves much of northern and western Missouri outside the Kansas City, St. Louis, and central Missouri core calling areas. Marshall, Missouri, is one of the communities in area code 660, and Marshall is the county seat of Saline County.
Area code 660 covers many cities and towns across a wide rural region. Major communities in the 660 area include Sedalia, Kirksville, Warrensburg, Maryville, Clinton, Moberly, and Marshall. The code also serves parts of the Lake of the Ozarks region, including communities such as Lake Ozark and Osage Beach.
Area code 660 covers farmland, small cities, and several well-known Missouri institutions and attractions. In Marshall, Missouri Valley College is a notable local institution. Other places in the 660 region include Truman State University in Kirksville, the University of Central Missouri in Warrensburg, and Whiteman Air Force Base near Knob Noster.
History of Area Code 660
Area code 660 was established on October 12, 1997. It was created in a split from area code 816, which had served a larger part of western and northern Missouri before the split.
Area code 660 is a split area code, not an overlay. The split happened as demand for new phone numbers grew in Missouri communities outside the Kansas City area. Kansas City and nearby suburbs kept 816, while many smaller cities and rural exchanges moved to 660.
Key Facts About Area Code 660
- Area code 660 is in the state of Missouri.
- Marshall, Missouri, is one of the communities served by area code 660.
- Area code 660 was created on October 12, 1997, in a split from area code 816.
- Area code 660 is a geographic area code, not a toll-free code.
- Area code 660 generally observes the Central Time Zone.
- Major cities in area code 660 include Sedalia, Kirksville, Warrensburg, Maryville, Clinton, Moberly, and Marshall.
- Truman State University in Kirksville and the University of Central Missouri in Warrensburg are both in the 660 calling region.
- Whiteman Air Force Base, near Knob Noster, is located in the 660 area code region.
Frequently Asked Questions
What state is area code 660 in?
Area code 660 is in Missouri.
What major cities use area code 660?
Major cities and communities in area code 660 include Marshall, Sedalia, Kirksville, Warrensburg, Maryville, Clinton, Moberly, Lake Ozark, and Osage Beach.
Is area code 660 a toll-free number?
No. Area code 660 is a geographic area code in Missouri.
Last updated: March 2026