|Area||14.48 sq mi (38 km2)|
|- land||14.35 sq mi (37 km2)|
|- water||0.12 sq mi (0 km2)|
|Mayor||Gary L. Graham|
|- summer (DST)||CDT (UTC-5)|
|Wikimedia Commons: O'Fallon, Illinois|
O'Fallon is a city in St. Clair County, Illinois, United States, and one of the fastest-growing communities in the Metropolitan St. Louis area. The 2010 census listed the city's population at 28,281. The city is the third largest city in the Metro-East and Southern Illinois. Due to its close proximity to Scott Air Force Base, the population receives a boost from military and federal civilian personnel, defense contractors, and military retirees.
O'Fallon, along with its namesake in St. Charles County, Missouri is part of the St. Louis Metropolitan Statistical Area. This makes O'Fallon (along with the two Troys in Illinois and Missouri) one of the few pairs of like-named municipalities to be part of the same MSA.
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, O'Fallon has gained population every year except 1930, when the census showed a net loss of 23 people.
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 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.
Parks and recreation
- Family Sports Park
- Hesse Park
- Katy Cavin's Community Center
- O'Fallon Community Park
- O'Fallon Memorial Pool
- Rock Springs Nature Park
- Nature center
- Jogging/cycling paths
- Nature trails
- Natural prairie
- Dog Park
- St. Clair Recreation Complex
- St. Ellen Mine Park
- Thoman Park
- Veteran's Monument
- O'Fallon Public Library
Registered historic places
Things To Do
The city of O’Fallon offers several things to do. During the summer months, there is the Strange Folk Festival where venders come to sell a variety of different things. Some of the pizzerias in O’Fallon are Peel and Gia’s. Peel is a more gourmet brick oven styled pizza; whereas, Gia’s offers a more family style pizza. O’Fallon also has several bars to offer. Those include Shooter’s, Haney’s, Town Lounge, and The Hut. Shooter’s is also known for their pulled pork and barbeque ribs. The Hut also offers sand volleyball during the summer months. The town also has several halls open to the public. Those include the VFW, Knights of Columbus, and the American Legion. On Friday nights, these halls often hold fish fries that are open to the public as well. O’Fallon also is home to two gourmet restaurants which include Paulo’s at the Mansion and Andria’s Steakhouse. Andria’s is known for their steak marinade. Paulo’s at the Mansion is located in historic O’Fallon. The city also has several parks. Some of those include Rock Springs Park, Hesse Park, O’Fallon Community Park, and O’Fallon Family Sports Park. O’Fallon Family Sports Park is the newest of parks. It has a splash pad and several tournaments are held there throughout the year. These tournaments range from baseball to soccer and lacrosse. The O’Fallon Community Park is home to the fields for both O’Fallon Township High School’s softball and baseball teams. The baseball team plays a Blazer Field. Also, the local Parks and Recreation soccer league games are held there. Another park in O’Fallon is Rohr Park. This is home to the soccer field of St. Clare Catholic School. O’Fallon is also located 5 miles from St. Clair Square in Fairview Heights. This mall is has 140 different stores. These shops cater to a variety of shoppers. 
- O'Fallon Community Consolidated School District # 90
- O'Fallon Central School District # 104
- O'Fallon District #203
- Private schools
O'Fallon is located at  O'Fallon is:(38.591549, −89.912000).
- 5 miles (8 km) from Scott Air Force Base
- 7 miles (11.5 km) from Lindenwood University – Belleville
- 10 miles (16 km) from McKendree University
- and 17 miles (27 km) from St. Louis, Missouri
According to the 2010 census, the city has a total area of 14.48 square miles (37.5 km2), of which 14.35 square miles (37.2 km2) (or 99.10%) is land and 0.12 square miles (0.31 km2) (or 0.83%) is water.
There were 21,910 people, 8,310 households, and 6,016 families residing in the city as of the census of 2000. 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 couples living 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 city 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.
- Bob Cryder, professional football player
- Bernie Fuchs, illustrator
- William Holden, actor
- Dawn Stern, actress
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