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Founded in 1854, O’Fallon’s namesake comes from Colonel John O’Fallon who was a wealthy gentleman from St. Louis. In downtown O’Fallon, a Baltimore and Ohio Railroad railroad depot was built, which helped put O’Fallon on the map. City lots were platted and sold at a public auction on May 18, 1854. A post office was established the following year and the city began attracting German settlers looking for fertile farming land. On January 27, 1874, O’Fallon was incorporated as a village. On March 14, 1905, the citizens voted for a change to the city form of government. Since its founding, The Ofallon IL Real Estate population has gained in numbers every year except 1930, when the census showed a net loss of six residents.
Growth in O’Fallon has accelerated since the 1980s. Following the expansion of Interstate 64, the 1990s saw a building boom with the construction of several now-established subdivisions in the Ofallon IL real estate market including Thornbury Hills, Nolin Creek Estates, Fairwood Hills, Deer Creek, Forest Hills, and the completion of Fairwood East. O’Fallon Township High School’s main campus at 600 South Smiley Street has undergone numerous additions over the past decades to ease overcrowding, including the creation of the separate 9th Grade Milburn Campus. A new city hall was completed in 1996. More than 50 percent of O’Fallon’s housing is less than 15 years old.
As of the census of 2000, the Ofallon IL real estate demographic was 21,910 people, 8,310 households, and 6,016 families residing in the city. The population density was 2,007.6 people per square mile (775.4/km²). There were 8,626 housing units at an average density of 790.4 per square mile (305.3/km²). The racial makeup of the city was 82.67% White, 11.99% African American, 0.23% Native American, 2.47% Asian, 0.07% Pacific Islander, 0.79% from other races, and 1.77% from two or more races. Hispanic or Latino of any race were 2.23% of the population.
There were 8,310 households out of which 39.6% had children under the age of 18 living with them, 59.0% were married couplesliving together, 10.5% had a female householder with no husband present, and 27.6% were non-families. 23.2% of all households were made up of individuals and 7.2% had someone living alone who was 65 years of age or older. The average household size was 2.62 and the average family size was 3.13.
In the city the population was spread out with 28.3% under the age of 18, 8.0% from 18 to 24, 32.2% from 25 to 44, 22.7% from 45 to 64, and 8.9% who were 65 years of age or older. The median age was 35 years. For every 100 females there were 93.2 males. For every 100 females age 18 and over, there were 90.1 males.
The median income for a household in the Ofallon IL real estate community was $55,927, and the median income for a family was $66,262. Males had a median income of $46,303 versus $30,158 for females. The per capita income for the city was $248,821. About 4.1% of families and 5.0% of the population were below the poverty line, including 5.0% of those under age 18 and 7.9% of those age 65 or over.