Barnhart is a census-designated place (CDP) in Jefferson County, Missouri, United States. The population was 5,682 at the 2010 census.
Barnhart is located at 38°20′16″N 90°24′14″W / 38.33778°N 90.40389°W / 38.33778; -90.40389 (38.337914, -90.403822).
According to the United States Census Bureau, the CDP has a total area of 5.25 square miles (13.60 km), of which 5.09 square miles (13.18 km) is land and 0.16 square miles (0.41 km) is water.
As of the census of 2010, there were 5,682 people, 1,920 households, and 1,576 families residing in the CDP. The population density was 1,116.3 inhabitants per square mile (431.0/km). There were 2,003 housing units at an average density of 393.5 per square mile (151.9/km). The racial makeup of the CDP was 97.4% White, 0.5% African American, 0.3% Native American, 0.4% Asian, 0.3% from other races, and 1.1% from two or more races. Hispanic or Latino of any race were 2.1% of the population.
There were 1,920 households of which 44.0% had children under the age of 18 living with them, 65.3% were married couples living together, 10.8% had a female householder with no husband present, 6.0% had a male householder with no wife present, and 17.9% were non-families. 12.6% of all households were made up of individuals and 2.7% had someone living alone who was 65 years of age or older. The average household size was 2.93 and the average family size was 3.17.
The median age in the CDP was 34.5 years. 27.6% of residents were under the age of 18; 8.1% were between the ages of 18 and 24; 28.8% were from 25 to 44; 28.5% were from 45 to 64; and 6.9% were 65 years of age or older. The gender makeup of the CDP was 50.4% male and 49.6% female.
As of the census of 2000, there were 6,108 people, 1,962 households, and 1,663 families residing in the CDP. The population density was 1,188.5 people per square mile (458.8/km²). There were 1,999 housing units at an average density of 389.0 per square mile (150.2/km²). The racial makeup of the CDP was 97.82% White, 0.36% African American, 0.13% Native American, 0.38% Asian, 0.02% Pacific Islander, 0.34% from other races, and 0.95% from two or more races. Hispanic or Latino of any race were 1.47% of the population.
There were 1,962 households out of which 48.8% had children under the age of 18 living with them, 70.8% were married couples living together, 9.1% had a female householder with no husband present, and 15.2% were non-families. 11.2% of all households were made up of individuals and 2.1% had someone living alone who was 65 years of age or older. The average household size was 3.08 and the average family size was 3.31.
In the CDP, the population was spread out with 30.9% under the age of 18, 8.8% from 18 to 24, 34.4% from 25 to 44, 20.8% from 45 to 64, and 5.1% who were 65 years of age or older. The median age was 32 years. For every 100 females, there were 103.7 males. For every 100 females age 18 and over, there were 100.0 males.
The median income for a household in the CDP was $56,559, and the median income for a family was $59,189. Males had a median income of $41,758 versus $28,630 for females. The per capita income for the CDP was $20,940. About 0.9% of families and 2.6% of the population were below the poverty line, including none of those under age 18 and 6.5% of those age 65 or over.
Barnhart Missouri neighborhoods include: Bayberry Farms, Country Trail Estates, East Central Jeff Co, Moss Hollow, Williamsburg