Jefferson County, Missouri facts for kids

Kids Encyclopedia Facts
Jefferson County, Missouri
Seal of Jefferson County, Missouri
Map
Map of Missouri highlighting Jefferson County
Location in the state of Missouri
Map of the USA highlighting Missouri
Missouri's location in the U.S.
Statistics
Founded 1818
Seat Hillsboro
Largest City Arnold
Area
 - Total
 - Land
 - Water

664 sq mi (1,720 km²)
657 sq mi (1,702 km²)
7.7 sq mi (20 km²), 1.2%
PopulationEst.
 - (2015)
 - Density

224,124
333/sq mi (129/km²)
Time zone Central: UTC-6/-5
Website: www.jeffcomo.org
Named for: Thomas Jefferson

Jefferson County is a county in the eastern portion of the state of Missouri. As of the 2010 census, the population was 218,733, 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.

In 1980, according to the U.S. census held that year, the county contained the mean center of U.S. population. Notably, this was the first census in which the center of population was west of the Mississippi River.

Jefferson County is part of the St. Louis Metropolitan Statistical Area and encompasses many of the city's southern suburbs.

Geography

According to the U.S. Census Bureau, the county has a total area of 664 square miles (1,720 km2), of which 657 square miles (1,700 km2) is land and 7.7 square miles (20 km2) (1.2%) is water. The county's eastern border is the Mississippi River and on the other side is Illinois.

Much of Jefferson County is in the projected totality path of the solar eclipse of August 21, 2017.

Adjacent counties

Major highways

  • I-55.svg Interstate 55
  • US 61.svg U.S. Route 61
  • US 67.svg U.S. Route 67
  • MO-21.svg Route 21
  • MO-30.svg Route 30
  • MO-109.svg Route 109
  • MO-110.svg Route 110
  • MO-141.svg Route 141
  • MO-231.svg Route 231

National protected area

  • Middle Mississippi River National Wildlife Refuge (part)

Demographics

Historical population
Census Pop.
1820 1,835
1830 2,592 41.3%
1840 4,296 65.7%
1850 6,928 61.3%
1860 10,344 49.3%
1870 15,380 48.7%
1880 18,736 21.8%
1890 22,484 20.0%
1900 25,712 14.4%
1910 27,878 8.4%
1920 26,555 −4.7%
1930 27,563 3.8%
1940 32,023 16.2%
1950 38,007 18.7%
1960 66,377 74.6%
1970 105,248 58.6%
1980 146,183 38.9%
1990 171,380 17.2%
2000 198,099 15.6%
2010 218,733 10.4%
Est. 2015 224,124 2.5%
U.S. Decennial Census
1790-1960 1900-1990
1990-2000 2010-2015

As of the 2010 Census Jefferson County had a population of 218,733. The reported ethnic and racial make up of the population was 95.4% non-Hispanic white, 0.8% African-American, 0.3% Native American, 0.6% Asian, 0.4% reporting some other race, 1.3% reporting two or more races and 1.6% Hispanic or Latino of any race.

As of the census of 2000, there were 198,099 people, 71,499 households, and 54,553 families residing in the county. The population density was 302 inhabitants per square mile (117/km2). There were 75,586 housing units at an average density of 115 per square mile (44/km²). The racial makeup of the county was 97.48% White, 0.08% Black or African American, 0.29% Native American, 0.36% Asian, 0.01% Pacific Islander, 0.24% from other races, and 0.93% from two or more races. Approximately 1.01% of the population were Hispanic or Latino of any race.

There were 71,499 households out of which 38.90% had children under the age of 18 living with them, 61.00% were married couples living together, 10.40% had a female householder with no husband present, and 23.70% were non-families. 18.90% of all households were made up of individuals and 6.10% had someone living alone who was 65 years of age or older. The average household size was 2.74 and the average family size was 3.12.

In the county, the population was spread out with 27.90% under the age of 18, 8.50% from 18 to 24, 31.80% from 25 to 44, 22.50% from 45 to 64, and 9.20% who were 65 years of age or older. The median age was 35 years. For every 100 females there were 98.90 males. For every 100 females age 18 and over, there were 95.90 males.

The median income for a household in the county was $60,636, and the median income for a family was $66,697. Males had a median income of $37,822 versus $25,440 for females. The per capita income for the county was $25,058. About 4.90% of families and 6.80% of the population were below the poverty line, including 8.10% of those under age 18 and 6.30% of those age 65 or over.

There were 146,316 registered voters in 2008. As of Oct. 24, 2012, there were 148,011.

Recreation

  • Big River Saddle Club
  • Brown's Ford
  • Cedar Hill
  • Fletcher House
  • High Ridge Civic Center
  • Rockford Beach
  • Jefferson Winter Park
  • Minnie Ha Ha Park
  • Morse Mill
  • Pleasant Valley
  • Sunridge
  • NW Jefferson County Sports Complex

Communities

Cities

Villages

Census-designated places

Other unincorporated communities


Jefferson County, Missouri Facts for Kids. Kiddle Encyclopedia.