Jefferson County, Missouri

Geography According to the U.S. Census Bureau, the county has a total area of 1,720 km² (664 mi²). 1,701 km² (657 mi²) of it is land and 19 km² (7 mi²) of it is water. The total area is 1.10% water.

Demographics As of the census of 2000, there are 198,099 people, 71,499 households, and 54,553 families residing in the county. The population density is 116/km² (302/mi²). There are 75,586 housing units at an average density of 44/km² (115/mi²). The racial makeup of the county is 97.48% White, 0.68% 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. 1.01% of the population are Hispanic or Latino of any race.

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

In the county the population is 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 are 65 years of age or older. The median age is 35 years. For every 100 females there are 98.90 males. For every 100 females age 18 and over, there are 95.90 males.

The median income for a household in the county is $46,338, and the median income for a family is $51,787. Males have a median income of $37,822 versus $25,440 for females. The per capita income for the county is $19,435. 6.80% of the population and 4.90% of families are below the poverty line. Out of the total people living in poverty, 8.10% are under the age of 18 and 6.30% are 65 or older.

Cities and Towns

• Arnold
• Barnhart
• Byrnes Mill
• Cedar Hill
• Cedar Hill Lakes
• Crystal City
• De Soto
• Festus
• Herculaneum
• High Ridge
• Hillsboro
• Horine
• Imperial
• Kimmswick
• Murphy
• Olympian Village
• Parkdale
• Pevely
• Scotsdale