Marion County is a county located in the northeastern portion of Missouri. As of the 2020 census, the population was 28,525.^[1] Its county seat is Palmyra.^[2] Unique from most third-class counties in the state, Marion has two county courthouses, the second located in Hannibal.^[3] The county was organized on December 23, 1826^[4][5] and named for General Francis Marion, the "Swamp Fox," who was from South Carolina and served in the American Revolutionary War.^[6] The area was known as the "Two Rivers Country" before organization.

Quick Facts Country, State ...

Marion County
County
Marion County courthouse in Palmyra
Location within the U.S. state of Missouri
Missouri's location within the U.S.
Coordinates: 39°49′N 91°37′W
Country	United States
State	Missouri
Founded	December 23, 1826
Named for	Francis Marion
Seat	Palmyra
Largest city	Hannibal
Area
• Total	444 sq mi (1,150 km2)
• Land	437 sq mi (1,130 km2)
• Water	7.4 sq mi (19 km2)  1.7%
Population  (2020)
• Total	28,525
• Density	64/sq mi (25/km2)
Time zone	UTC−6 (Central)
• Summer (DST)	UTC−5 (CDT)
Congressional district	6th
Website	http://marioncountymo.com/

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Marion County is part of the Hannibal, Missouri Micropolitan Statistical Area, which is included in the Quincy-Hannibal, IL-MO Combined Statistical Area.

According to the U.S. Census Bureau, the county has a total area of 444 square miles (1,150 km²), of which 437 square miles (1,130 km²) is land, and 7.4 square miles (19 km²) (1.7%) is water.^[7]

Marion County was created by the state legislature in 1845 from parts of Ralls and Shelby Counties. It was settled from Virginia and Kentucky by farmers looking for cheap farmland; some owned slaves. It was named after Francis Marion, a general in the Revolutionary War. The county seat is Palmyra, which was established in 1833 and became a locally important river port on the Mississippi. By the late 1800s, the county was the center of a thriving agricultural community. Tobacco was the main crop, though cotton, wheat, barley, oats, and hay were also grown. Livestock included horses, mules, and cattle.^[8]

The best known native son is Mark Twain (Samuel Langhorne Clemens) born in 1835, in the village of Florida. His youthful experiences in Hannibal became the setting for the adventures of Tom Sawyer and Huckleberry Finn.^[9] Other prominent locals included Governor John S. Phelps, and Confederate General A.P. Morehead. The region was bitterly divided in the Civil War but Unionist elements prevailed. Palmyra was the site of a skirmish in 1862, and the county was the site of several other battles and raids. Today, Marion County continues to be primarily an agricultural county. It is home to a number of historic sites and buildings, with a major tourist industry focused on Mark Twain characters and settings.^[10]

As of the census^[16] of 2010, there were 28,781 people, 11,066 households, and 7,524 families residing in the county. The population density was 65 inhabitants per square mile (25/km²). There were 12,443 housing units at an average density of 28 units per square mile (11/km²). The racial makeup of the county was 93.26% White, 4.62% Black or African American, 0.27% Native American, 0.28% Asian, 0.08% Pacific Islander, 0.18% from other races, and 1.32% from two or more races. Approximately 0.89% of the population were Hispanic or Latino of any race. 28.5% were German, 25.6% American, 11.0% Irish, and 10.3% English ancestry.

There were 11,066 households, out of which 33.30% had children under the age of 18 living with them, 53.50% were married couples living together, 11.40% had a female householder with no husband present, and 32.00% were non-families. 28.10% of all households were made up of individuals, and 13.80% had someone living alone who was 65 years of age or older. The average household size was 2.44, and the average family size was 2.98.

In the county, the population was spread out, with 25.70% under the age of 18, 9.50% from 18 to 24, 26.40% from 25 to 44, 21.70% from 45 to 64, and 16.60% who were 65 years of age or older. The median age was 37 years. For every 100 females, there were 89.40 males. For every 100 females age 18 and over, there were 85.70 males.

The median income for a household in the county was $31,774, and the median income for a family was $41,290. Males had a median income of $30,935 versus $20,591 for females. The per capita income for the county was $16,964. About 9.30% of families and 12.10% of the population were below the poverty line, including 15.30% of those under age 18 and 10.50% of those age 65 or over.

• National Register of Historic Places listings in Marion County, Missouri