Location of Oakville, Missouri
|• Total||17.73 sq mi (45.92 km2)|
|• Land||15.93 sq mi (41.26 km2)|
|• Water||1.80 sq mi (4.66 km2)|
|Elevation||600 ft (183 m)|
|• Density||2,268.9/sq mi (876.0/km2)|
|Time zone||Central (CST) (UTC-6)|
|• Summer (DST)||CDT (UTC-5)|
|GNIS feature ID||0756472|
Oakville is a census-designated place (CDP) in St. Louis County, Missouri, United States. The population was 36,143 at the 2010 census. Oakville is south of the city of St. Louis and borders the Mississippi and Meramec rivers; the area is part of "South County" (south St. Louis County).
Oakville is located at  According to the United States Census Bureau, the CDP has a total area of 17.73 square miles (45.92 km2), of which, 15.93 square miles (41.26 km2) of it is land and 1.80 square miles (4.66 km2) is water.(38.458620, -90.319324).
As of the census of 2010, there were 36,143 people, 13,788 households, and 10,511 families residing in the CDP. The population density was 2,268.9 inhabitants per square mile (876.0/km2). There were 14,314 housing units at an average density of 898.6 per square mile (347.0/km2). The racial makeup of the CDP was 96.0% White, 0.8% African American, 0.1% Native American, 1.8% Asian, 0.3% from other races, and 1.0% from two or more races. Hispanic or Latino of any race were 1.4% of the population.
There were 13,788 households of which 32.4% had children under the age of 18 living with them, 65.4% were married couples living together, 7.7% had a female householder with no husband present, 3.2% had a male householder with no wife present, and 23.8% were non-families. 19.9% of all households were made up of individuals and 8% had someone living alone who was 65 years of age or older. The average household size was 2.61 and the average family size was 3.02.
The median age in the CDP was 43.7 years. 22.8% of residents were under the age of 18; 8% were between the ages of 18 and 24; 21.1% were from 25 to 44; 33.9% were from 45 to 64; and 14.3% were 65 years of age or older. The gender makeup of the CDP was 49.0% male and 51.0% female.
As of the census of 2000, there were 35,309 people, 12,530 households, and 9,923 families residing in the CDP. The population density was 2,196.4 people per square mile (847.8/km²). There were 12,791 housing units at an average density of 795.7 per square mile (307.1/km²). The racial makeup of the CDP was 98.19% White, 0.07% African American, 0.01% Native American, 0.92% Asian, 0.02% Pacific Islander, 0.20% from other races, and 0.60% from two or more races. Hispanic or Latino of any race were 1.03% of the population.
There were 12,530 households out of which 39.1% had children under the age of 18 living with them, 69.6% were married couples living together, 7.0% had a female householder with no husband present, and 20.8% were non-families. 17.3% of all households were made up of individuals and 5.8% had someone living alone who was 65 years of age or older. The average household size was 2.81 and the average family size was 3.20.
In the CDP the population was spread out with 27.0% under the age of 18, 8.9% from 18 to 24, 26.8% from 25 to 44, 27.6% from 45 to 64, and 9.6% who were 65 years of age or older. The median age was 38 years. For every 100 females there were 97.2 males. For every 100 females age 18 and over, there were 94.0 males.
The median income for a household in the CDP was $68,248, and the median income for a family was $76,223 (these figures had risen to $73,027 and $87,568 respectively as of a 2007 estimate). Males had a median income of $52,123 versus $33,604 for females. The per capita income for the CDP was $26,750. About 2.0% of families and 2.8% of the population were below the poverty line, including 3.3% of those under age 18 and 4.0% of those age 65 or over.
Oakville belongs entirely to the Mehlville School District (R-9) and the St. Louis County Special School District. Oakville High School and Mehlville High School are the two high schools in the Mehlville School District. Oakville Middle School is also located within the Mehlville School district.  There are three Catholic grade schools in Oakville: St. Francis of Assisi, Queen of All Saints, and St. Margaret Mary Alacoque.
St. Louis Community College's South County Education and University Center is located off Meramec Bottom Road at Lemay Ferry Road.
- "US Gazetteer files 2010". United States Census Bureau. Retrieved 2012-07-08.
- "American FactFinder". United States Census Bureau. Retrieved 2012-07-08.
- "American FactFinder". United States Census Bureau. Retrieved 2008-01-31.
- "US Board on Geographic Names". United States Geological Survey. 2007-10-25. Retrieved 2008-01-31.
- "Race, Hispanic or Latino, Age, and Housing Occupancy: 2010 Census Redistricting Data (Public Law 94-171) Summary File (QT-PL), Oakville CDP, Missouri". U.S. Census Bureau, American FactFinder 2. Retrieved October 26, 2011.
- "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. 2011-02-12. Retrieved 2011-04-23.
- "Melhville School District".
- "Cliff Cave Branch." St. Louis County Library. Retrieved on August 18, 2009.
- "Oakville CDP, Missouri." U.S. Census Bureau. Retrieved on August 18, 2009.