Miller County is a county located in the U.S. state of Missouri. As of the 2020 United States census, the population was 24,722.^[1] Its county seat is Tuscumbia.^[2] The county was organized February 6, 1837 and named for John Miller,^[3] former U.S. Representative and Governor of Missouri.

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Miller County
County
The Miller County Courthouse in Tuscumbia
Location within the U.S. state of Missouri
Missouri's location within the U.S.
Coordinates: 38°13′N 92°26′W
Country	United States
State	Missouri
Founded	February 6, 1837
Named for	John Miller
Seat	Tuscumbia
Largest city	Eldon
Area
• Total	600 sq mi (2,000 km2)
• Land	593 sq mi (1,540 km2)
• Water	7.4 sq mi (19 km2)  1.2%
Population  (2020)
• Total	24,722
• Density	41/sq mi (16/km2)
Time zone	UTC−6 (Central)
• Summer (DST)	UTC−5 (CDT)
Congressional district	3rd
Website	www.millercountymissouri.org

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According to the U.S. Census Bureau, the county has a total area of 600 square miles (1,600 km²), of which 593 square miles (1,540 km²) is land and 7.4 square miles (19 km²) (1.2%) is water.^[4]

As of the census^[10] of 2000, there were 23,564 people, 9,284 households, and 6,443 families residing in the county. The population density was 40 people per square mile (15 people/km²). There were 11,263 housing units at an average density of 19 units per square mile (7.3/km²). The racial makeup of the county was 97.99% White, 0.28% Black or African American, 0.46% Native American, 0.13% Asian, 0.02% Pacific Islander, 0.29% from other races, and 0.84% from two or more races. Approximately 0.98% of the population were Hispanic or Latino of any race.

There were 9,284 households, out of which 32.60% had children under the age of 18 living with them, 56.00% were married couples living together, 9.20% had a female householder with no husband present, and 30.60% were non-families. 26.10% of all households were made up of individuals, and 11.90% had someone living alone who was 65 years of age or older. The average household size was 2.50 and the average family size was 3.00.

In the county, the population was spread out, with 26.30% under the age of 18, 8.40% from 18 to 24, 27.40% from 25 to 44, 22.70% from 45 to 64, and 15.30% who were 65 years of age or older. The median age was 37 years. For every 100 females there were 97.30 males. For every 100 females age 18 and over, there were 93.70 males.

The median income for a household in the county was $30,977, and the median income for a family was $36,770. Males had a median income of $26,225 versus $18,903 for females. The per capita income for the county was $15,144. About 10.80% of families and 14.20% of the population were below the poverty line, including 19.30% of those under age 18 and 14.70% of those age 65 or over.

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