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Montgomery County (Mo.)
Located in east-central Missouri, the county was named for Revolutionary War general Richard Montgomery. The county seat is Montgomery City.
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Moniteau County (Mo.)
Located in central Missouri, the county was named for Moniteau Creek. The name has its origins in an Algonquian word meaning 'Great Spirit'. The county seat is California.
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Lafayette County (Mo.)
Located in west-central Missouri, the county was originally named Lillard for James Lillard, a member of the first state legislature. In 1825 it was renamed for General Lafayette. The county seat is Lexington.
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Carroll County (Mo.)
Located in northwest Missouri, the county was named for Declaration of Independence signatory Charles Carroll. The county seat is Carrollton.
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Randolph County (Mo.)
Located in north-central Missouri, the county was named for Senator John Randolph of Virginia. The county seat is Huntsville.
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Ralls County (Mo.)
Located along the Mississippi River in northeastern Missouri, the county borders Illinois , and was named for Missouri state legislator Daniel Ralls. The county seat is New London.
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Platte County (Mo.)
Located on the western border with Kansas, the county encompasses part of the Kansas City metropolitan area. It was named for the Platte River. The county seat is Platte City.
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Monroe County (Mo.)
Located in central Missouri, the county was named for President James Monroe, and was the birthplace of Mark Twain. The county seat is Paris.
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Madison County (Mo.)
Located in the southeastern Lead Belt, the county was named for President James Madison. The county seat is Fredericktown.
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Livingston County (Mo.)
Located in northwest Missouri, the county was named for Edward Livingston, U.S. Secretary of State. The county seat is Chillicothe.
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Lewis County (Mo.)
Located in the north-east corner, along the Mississippi River, the county borders Illinois. It was named for explorer Meriwether Lewis. The county seat is Monticello.
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Knox County (Mo.)
Located in the north-east corner of the state, the county was named for Revolutionary War hero, Henry Knox. The county seat is Edina.
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Jackson County (Mo.)
Located on the Kansas border, the county encompasses Kansas City (Mo.), one of the two county seats. The other is Independence. The county was named for President Andrew Jackson.
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Howard County (Mo.)
Located in central Missouri along the Missouri River, it encompasses part of the Columbia metropolitan area. The county was named the first governor of the Missouri territory, Benjamin Howard. The county seat is Fayette.
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Daviess County (Mo.)
Located in northwestern Missouri, the county was named for War of 1812 soldier, Major Joseph Hamilton Daviess. The county seat is Gallatin.
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Clay County (Mo.)
Located in the north-west corner of the state, the county encompasses part of Kansas City (Mo.). It was named for statesman Henry Clay. The county seat is Liberty.
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Chariton County (Mo.)
Located in north-central Missouri, the county was named for the Chariton River. The county seat is Keytesville.
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Cass County (Mo.)
Located on the Kansas border, the county is part of the greater Kansas City metropolitan area. Originally named Van Buren County, it was renamed for Senator Lewis Cass. The county seat is Harrisonville.
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Callaway County (Mo.)
Located along the Missouri River in the center of the state, the county was named for War of 1812 veteran Captain James Callaway. The county seat is Fulton.
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Buchanan County (Mo.)
Located in the northest corner of the state, along the Kansas border, the county was originally named for early settler Hiram Roberts. It was renamed for President James Buchanan. The county seat is St. Joseph.
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Audrain County (Mo.)
Located in east-central Missouri, the county was originally settled by Kentucky pioneers beginning in 1830. The county seat is Mexico.
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Yates, Jackson
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Saline County (Mo.)
The county is located in north-central Missouri between Kansas City and St. Louis. The county seat is Marshall (Mo.). The county was named for the salt mines in the region.