O'Fallon, Illinois

O'Fallon: Township in St. Clair County, Illinois

About

O'Fallon is a township located in the county of Saint Clair in the U.S. state of Illinois. Its population at the 2010 census was 28,281 and a population density of 790 people per km². After 10 years in 2020 city had an estimated population of 29,606 inhabitants.

O'Fallon locator map
Location of O'Fallon on Illinois map.

Quick Facts about O'Fallon

Population : 29,606 (2020)
Country : United States of America
State : Illinois (United States)
County : Saint Clair County
Area : 35.78 km2
Time Zone : America/Chicago
Local time : 19:48:25 (23rd May 2024)
Density : 827 Pop. per km² as of 2020
Population growth : 4.48% (2010-2020)
Map highlighting O%27Fallon Township  St. Clair County  Illinois locator map image
Map highlighting O%27Fallon Township St. Clair County Illinois
Map highlighting O%27Fallon Township  St. Clair County  Illinois locator map image

Geography

O'Fallon is located at 38°35'32"N 89°54'40"W (38.5922700, -89.9112100).

O'Fallon map

Demographics

The population of O'Fallon increased by 4.48% in 10 years.

Year Population % Change Method
2010 28,281 - census
2011 29,423 3.88% estimation process
2012 29,328 -0.32% estimation process
2013 29,224 -0.36% estimation process
2014 29,151 -0.25% estimation process
2015 29,124 -0.09% estimation process
2016 29,199 0.26% estimation process
2017 29,364 0.56% estimation process
2018 29,602 0.8% estimation process
2019 29,621 0.06% estimation process
2020 29,606 -0.05% estimation process

Schools in O'Fallon

College & universities near O'Fallon, IL

Code Name City ZIP
147013 McKendree University Lebanon (IL) 62254-1291

Stations (9)

Amtrak & bus stations near O'Fallon, IL

Code Name Address Type
STL Gateway Transportation Center 551 South 16th St. RAIL
ALN Alton 3400 College Ave. RAIL
KWD Kirkwood 110 West Argonne Dr. RAIL
CEN Centralia station 108 East Broadway RAIL
CRV Carlinville 128 Alton Rd. RAIL

Post offices near O'Fallon

Post Office Name City ZIP
O Fallon Post Office O Fallon (IL) 62269

Other places with the same name (2)

  • O'Fallon , Missouri The most populous city in St. Charles County, Missouri. It is located in the eastern part of the county. O'Fallon is known for its many parks and green spaces, its many historical sites, and its many attractions, such as the O'Fallon City Hall and the O'Fallon History Museum. with a population of 89,769 people.

Other cities in Saint Clair County

Cities, towns, neighborhoods & other populated places in Saint Clair County , IL. (more)

City Name Population Title
Belleville 40,536 The county seat of St.
East Saint Louis 25,776 City in St.
Crest Hill 20,209 City in Will County, Illinois
Fairview Heights 16,127 City in Saint Clair County, Illinois, United States
Cahokia 13,742 Village in St.
Shiloh 13,653 Town in St.
Swansea 13,276 Village in St.
Pontiac 11,176 City in Illinois, USA
Summit 10,977 Village in Illinois, USA
Mascoutah 8,076 City in Saint Clair County, Illinois, United States
Centreville 4,844 City in Illinois, United States
Lebanon 4,225 City in St.
Freeburg 4,223 City in Illinois, United States of America
Rosemont 4,147 Village in the U.
Caseyville 4,115 City in Illinois, United States of America
Dupo 3,845 City in Illinois, United States of America

Distance to Other Cities

O'Fallon distances to largest Illinois cities