O'Fallon, Missouri

O'Fallon: 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.


O'Fallon is a city located in the county of Saint Charles in the U.S. state of Missouri. Its population at the 2010 census was 79,329 and a population density of 1,031 people per km². After 10 years in 2020 city had an estimated population of 89,769 inhabitants.

The city was created 168 years ago in 1855.

O'Fallon is a city located in St. Charles County, Missouri, part of the Greater St. Louis metropolitan area. The city was founded in the 1850s along the newly completed Pacific Railroad line. O’Fallon is named after Colonel John O’Fallon.

Key Facts About O’Fallon

Population: Approximately 89,000 as of 2019

Economy: Major employers in O’Fallon include Mastercard, Citi, and True Manufacturing. The city has a diverse mix of financial services, healthcare, manufacturing, retail and technology companies.

Geography: O’Fallon covers over 28 square miles near the intersection of I-70 and Highway K. It features a historic downtown surrounded by newer suburban neighborhoods.

Things to Do in O’Fallon

Some of the most popular attractions and activities in O’Fallon include:

  • O’Day Park - Large park with hiking/biking trails, sports fields, picnic areas and a lake.
  • Fort Zumwalt Park - Home to a public golf course, amphitheater for concerts, trails and a playground.
  • Historic Downtown O’Fallon - Offers restaurants, boutiques and entertainment along Main Street.
  • St. Charles County Heritage Museum - Details local history through exhibits and historic buildings.
  • Katy Trail - Popular rail-trail for biking and hiking through scenic Missouri landscapes.

In summary, O’Fallon blends St. Louis metro accessibility with small-town Midwestern charm and abundant parks and trails.

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

Quick Facts about O'Fallon

Population : 89,769 (2020)
Country : United States of America
State : Missouri (United States)
County : Saint Charles County
Phone Area Codes : 636
Area : 76.93 km2
Altitude : 541 feet / 165 meters
Establishment : January 01, 1856 (168 years ago)
Time Zone : America/Chicago
Local time : 22:34:42 (21st February 2024)
Density : 1,167 Pop. per km² as of 2020
Population growth : 11.63% (2010-2020)
Fort Zumwalt North High School image
Fort Zumwalt North High School
Fort Zumwalt North High School image


O'Fallon is located at 38°48'38"N 90°41'59"W (38.8106100, -90.6998500).

O'Fallon map


The population of O'Fallon increased by 11.63% in 10 years.

Year Population % Change Method
2010 79,329 - census
2011 81,184 2.28% estimation process
2012 82,136 1.16% estimation process
2013 83,136 1.2% estimation process
2014 84,221 1.29% estimation process
2015 85,061 0.99% estimation process
2016 86,449 1.61% estimation process
2017 87,523 1.23% estimation process
2018 88,364 0.95% estimation process
2019 88,673 0.35% estimation process
2020 89,769 1.22% estimation process

O'Fallon, O'Fallon Station

People born in O'Fallon (9)

People born in O'Fallon, including suicide on October 17, 2006 Megan Meier, model Erika Hebron, martial artist Mike Corey, .


  • T. J. Moe (American football player) he was born in 14/10/1990
  • Ted Vincent (American football player) he was born in 10/08/1956
  • Napheesa Collier (American basketball player) she was born in 23/09/1996
  • Jake Bond (US association football player) he was born in 04/07/1992
  • Josh Sargent (American association football player) he was born in 20/02/2000
  • Melissa Gentile (American softball coach) she was born in 01/01/1978

Schools in O'Fallon

College & universities near O'Fallon, MO

Code Name City ZIP
262031 St Charles Community College Cottleville (MO) 63376-0975
455099 Urshan Graduate School of Theology Wentzville (MO) 63385
460996 The Salon Professional Academy-St Charles St. Charles (MO) 63301-1021
177968 Lindenwood University Saint Charles (MO) 63301-1695
179308 Saint Louis Community College Bridgeton (MO) 63044

Stations (6)

Amtrak & bus stations near O'Fallon, MO

Code Name Address Type
KWD Kirkwood 110 West Argonne Dr. RAIL
WAH Washington 301 West Front St. RAIL
STL Gateway Transportation Center 551 South 16th St. RAIL
ALN Alton 3400 College Ave. RAIL
HEM Hermann Wharf & Gutenberg Sts. RAIL

Post offices near O'Fallon

Post Office Name City ZIP
O Fallon Post Office O Fallon (MO) 63366
Saint Peter Post Office Saint Peters (MO) 63376
Cottlevill Post Office Cottleville (MO) 63338
Saint Charles South Post Office Saint Charles (MO) 63303
Wentzvill Post Office Wentzville (MO) 63385

Other places with the same name (2)

Other cities in Saint Charles County

Cities, towns, neighborhoods & other populated places in Saint Charles County , MO.

City Name Population Title
Saint Charles 71,761 A city in St.
Saint Peters 58,043 The most populous city in St.
Wentzville 43,109 A city in St.
Lake Saint Louis 17,186 City in Saint Charles County, Missouri, United States
Dardenne Prairie 13,397 City in Saint Charles County, Missouri, United States
Cottleville 5,925 City in Saint Charles County, Missouri, United States
Weldon Spring 5,546 City in Saint Charles County, Missouri, United States
Saint Paul 2,796 City in St.
Foristell 618 City in Saint Charles County, Missouri, United States
West Alton 529 City in Saint Charles County, Missouri, United States
New Melle 506 City in Saint Charles County, Missouri, United States
Josephville 485 Human settlement in St.
Portage Des Sioux 329 City in St.
Augusta 267 City in St.
Weldon Spring Heights 90 Village in the United States

Distance to Other Cities

O'Fallon distances to largest Missouri cities