Stoddard County is a county located in the southeastern portion of the U.S. state of Missouri. As of the 2020 census, the population was 28,672. The county seat is Bloomfield. The county was officially organized on January 2, 1835, and is named for Amos Stoddard, the first American commandant of Upper Louisiana.
Shelby County is a county located in the northeastern portion of the U.S. state of Missouri. As of the 2020 census, the population was 6,103. Its county seat is Shelbyville. The county was organized January 2, 1835, and named for Governor Isaac Shelby of Kentucky.
Saline County is located along the Missouri River in the U.S. state of Missouri. As of the 2010 census, the population was 23,370. Its county seat is Marshall. The county was established November 25, 1820, and named for the region's salt springs.
Platte County is a county located in the northwestern portion of the U.S. state of Missouri and is part of the Kansas City metropolitan area. As of the 2020 census, the population was 106,718. Its county seat is Platte City. The county was organized December 31, 1838, from the Platte Purchase, named for the Platte River. The Kansas City International Airport is located in the county, approximately one mile west of Interstate 29 between mile markers 12 and 15. The land for the airport was originally in an unincorporated portion of Platte County before being annexed by Platte City, and eventually Kansas City.
Pike County is a county on the eastern border of the U.S. state of Missouri, bounded by the Mississippi River. As of the 2010 census, the population was 18,516. Its county seat is Bowling Green. Its namesake was a city in middle Kentucky, a region from where many early migrants came. The county was organized December 14, 1818, and named for explorer Zebulon Pike. The folksong "Sweet Betsy from Pike" is generally thought to be associated with Pike County, Missouri.
Marion County is a county located in the northeastern portion of Missouri. As of the 2010 census, the population was 28,781. Its county seat is Palmyra. Unique from most third-class counties in the state, Marion has two county courthouses, the second located in Hannibal. The county was organized on December 23, 1826 and named for General Francis Marion, the "Swamp Fox," who was from South Carolina and served in the American Revolutionary War. The area was known as the "Two Rivers Country" before organization.
Macon County is a county located in the northern portion of the U.S. state of Missouri. As of the 2020 census, the population was 15,209. Its county seat is Macon. The county was organized January 6, 1837, and named for Nathaniel Macon, a Revolutionary War hero and North Carolina politician.
Linn County is a county located in the northern portion of the U.S. state of Missouri. As of the 2020 census, the population was 11,874. Its county seat is Linneus. The county was organized January 1, 1837 and named after U.S. Senator Lewis F. Linn of Missouri.
Lewis County is a county located in the northeastern portion of the U.S. state of Missouri. As of the 2020 census, the population was 10,032. Its county seat is Monticello. The county was organized January 2, 1833 and named for Meriwether Lewis, the explorer and Governor of the Louisiana Territory.
Knox County is a county located in the northeast portion of the U.S. state of Missouri. As of the 2020 census, its population was 3,744, making it the third-least populous county in Missouri. Its county seat is Edina. The county was organized February 14, 1845 and named for U.S. Secretary of War General Henry Knox.
Jefferson County is located in the eastern portion of the state of Missouri. It is a part of the St. Louis Metropolitan Area. As of the 2020 census, the population was 226,739, making it the sixth-most populous county in Missouri. Its county seat is Hillsboro. The county was organized in 1818 and named in honor of former president Thomas Jefferson.
Holt County is a county located in the northwestern portion of the U.S. state of Missouri. As of the 2020 census, the population was 4,223. It's county seat is Oregon. The county was organized February 15, 1841. Originally named Nodaway County, it was soon renamed for David Rice Holt (1803–1840), a Missouri state legislator from Platte County.
Crawford County is a county located in the east-central portion of the U.S. state of Missouri. At the 2010 Census, the population was 24,696. Its county seat is Steelville. The county was organized in 1829 and is named after U.S. Senator William H. Crawford of Georgia.
Chariton County is a county located in the north-central portion of the U.S. state of Missouri. As of the 2020 census, the population was 7,408. Its county seat is Keytesville. The county was organized November 16, 1820, from part of Howard County and is named for the Chariton River.
Carroll County is a county located in the U.S. state of Missouri. As of the 2020 census, the county had a population of 8,495. Its county seat is Carrollton. The county was organized on January 2, 1833, from part of Ray County and named for Charles Carroll of Carrollton, a signer of the Declaration of Independence.
Atchison County is the northwesternmost county in the U.S. state of Missouri. As of the 2020 census, the county had a population of 5,305. Its county seat is Rock Port. It was originally known as Allen County when it was detached from Holt County in 1843. The county was officially organized on February 14, 1845, and named for U.S. Senator David Rice Atchison from Missouri.
Fairfax is a city in Clark Township, Atchison County, Missouri, United States. The population was 648 at the 2020 census.
Rock Port is a city in, and the county seat of, Atchison County, Missouri, United States. The population was 1,278 at the 2020 census.
Tarkio is a city in Tarkio Township, Atchison County, Missouri, United States. The population was 1,506 at the 2020 census. It was platted in 1880 and incorporated in 1881. The name "Tarkio" is from a Native American word meaning "place where walnuts grow". Historically, the economy of the city was based on agriculture and its status as a college town.
The Tarkio River is a non-navigable river that stretches for approximately 140 miles (225 km) from Cass County, Iowa to its mouth on the Missouri River in Holt County, Missouri.
