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O'Fallon, Missouri
Fort Zumwalt Park
Flag of O'Fallon, Missouri
Flag
Official seal of O'Fallon, Missouri
Seal
Motto(s): 
Tradition with Vision
Location in the state of Missouri
Location in the state of Missouri
Country United States
State  Missouri
County St. Charles
Metro Greater St. Louis
First Settled 1856
Incorporated September 25, 1912
Government
 • Type Mayor-council government
Area
 • City 30.51 sq mi (79.01 km2)
 • Land 30.50 sq mi (79.00 km2)
 • Water 0.00 sq mi (0.01 km2)
Elevation
614 ft (187 m)
Population
 (2020)
 • City 91,316
 • Estimate 
(2023)
94,074
 • Density 2,993.67/sq mi (1,155.87/km2)
 • Metro
2,810,056 (US: 19th)
Time zone UTC−6 (CST)
 • Summer (DST) UTC−5 (CDT)
ZIP code
63366, 63368
Area code(s) 636
FIPS code 29-54074
GNIS feature ID 2395303

O'Fallon (say it "oh-FAL-un") is a city in St. Charles County, Missouri, United States. It's part of the larger St. Louis area. You can find it along Interstate 64 and Interstate 70.

In 2020, O'Fallon had about 91,316 people living there. This makes it the biggest suburb of St. Louis. It's also the largest city in St. Charles County and the 7th largest city in all of Missouri. There's another city called O'Fallon in Illinois, which is also near St. Louis. It's pretty cool that two cities with the same name are so close!

History of O'Fallon

The St. Mary's Institute of O'Fallon
St. Mary's Institute of O'Fallon

O'Fallon was started in 1856 by a man named Nicholas Krekel. His older brother, Judge Arnold Krekel, named the community after John O'Fallon. John O'Fallon was the president of the North Missouri Railroad at the time.

A post office opened in O'Fallon in 1859. Nicholas Krekel was the very first postmaster. A historic building, the St. Mary's Institute of O'Fallon, was added to the National Register of Historic Places in 2007. This means it's an important place in history that should be protected.

Money magazine has often listed O'Fallon as one of the "Best Places to Live." It was ranked 39th in 2006, 68th in 2008, 26th in 2010, and 42nd in 2017.

Geography and Climate

O'Fallon covers about 29.20 square miles (75.63 square kilometers). Most of this area is land, with only a tiny bit of water.

O'Fallon's Climate

O'Fallon has a humid subtropical climate. This means it has hot and humid summers. The winters are usually moderately cold.

Climate data for O'Fallon, Missouri
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Record high °F (°C) 76
(24)
85
(29)
88
(31)
94
(34)
92
(33)
97
(36)
105
(41)
107
(42)
102
(39)
95
(35)
85
(29)
76
(24)
107
(42)
Mean daily maximum °F (°C) 38
(3)
45
(7)
55
(13)
66
(19)
75
(24)
83
(28)
88
(31)
87
(31)
80
(27)
69
(21)
55
(13)
42
(6)
65
(19)
Mean daily minimum °F (°C) 18
(−8)
24
(−4)
33
(1)
44
(7)
54
(12)
63
(17)
68
(20)
66
(19)
58
(14)
45
(7)
35
(2)
24
(−4)
44
(7)
Record low °F (°C) −23
(−31)
−14
(−26)
−11
(−24)
18
(−8)
26
(−3)
39
(4)
45
(7)
36
(2)
27
(−3)
19
(−7)
−5
(−21)
−28
(−33)
−28
(−33)
Average precipitation inches (mm) 1.79
(45)
2.26
(57)
3.38
(86)
3.58
(91)
4.34
(110)
3.62
(92)
4.18
(106)
3.13
(80)
3.29
(84)
3.10
(79)
3.56
(90)
2.41
(61)
38.64
(981)

People of O'Fallon

Historical population
Census Pop.
1880 295
1920 588
1930 594 1.0%
1940 618 4.0%
1950 789 27.7%
1960 3,770 377.8%
1970 7,018 86.2%
1980 8,677 23.6%
1990 18,698 115.5%
2000 46,169 146.9%
2010 79,329 71.8%
2020 91,316 15.1%
U.S. Decennial Census

O'Fallon has grown a lot over the years! In 2020, there were 91,316 people living in the city.

Population Details

In 2020, O'Fallon had over 31,000 households. Many of these households (about 37.5%) had children under 18 living there. Most households (60.5%) were married couples.

The people in O'Fallon come from many different backgrounds. The largest group is White, followed by Black or African-American, Asian, and people of two or more races. About 4% of the population is Hispanic or Latino.

The average age in O'Fallon in 2020 was about 37.5 years old. About 25.4% of the people were under 18. This means there are lots of kids and teens in the city!

O'Fallon city, Missouri – Racial and ethnic composition
Note: the U.S. census treats Hispanic/Latino as an ethnic category. This table excludes Latinos from the racial categories and assigns them to a separate category. Hispanics/Latinos may be of any race.
Race / Ethnicity (NH = Non-Hispanic) Pop 2000 Pop 2010 Pop 2020 % 2000 % 2010 % 2020
White alone (NH) 43,576 69,979 74,340 94.38% 88.21% 81.41%
Black or African American alone (NH) 1,029 3,135 4,568 2.23% 3.95% 5.00%
Native American or Alaska Native alone (NH) 96 162 140 0.21% 0.20% 0.15%
Asian alone (NH) 340 2,485 3,688 0.74% 3.13% 4.04%
Pacific Islander alone (NH) 10 40 79 0.02% 0.05% 0.09%
Some Other Race alone (NH) 40 105 276 0.09% 0.13% 0.30%
Mixed Race or Multi-Racial (NH) 407 1,264 4,586 0.88% 1.59% 5.02%
Hispanic or Latino (any race) 671 2,159 3,639 1.45% 2.72% 3.99%
Total 46,169 79,329 91,316 100.00% 100.00% 100.00%

Economy and Jobs

Many businesses have a presence in O'Fallon. Mastercard, a big financial company, has a large office here. Venture Stores used to have its main office and a large warehouse in O'Fallon. Now, True Manufacturing uses those buildings. Air Evac Lifeteam, which provides medical helicopter services, moved its main office to O'Fallon in 2015.

Parks and Fun Places

O'Fallon has many great parks and places for recreation:

  • Civic Park: This 20-acre park has the Alligator's Creek Aquatic Center, a bandstand, and an amphitheater for shows.
  • Dames Park: A 59-acre sports park with three football fields and a fitness course.
  • Fort Zumwalt Park: This 47.5-acre park has a fishing lake, a disc golf course, playgrounds, and the historic Fort Zumwalt.
  • Knaust Park: A 6-acre park with a playground and a walking path.
  • O'Fallon Sports Park: A huge 95-acre soccer complex with 12 fields, playgrounds, and places to buy snacks. It's also home to the Renaud Spirit Center.
  • Ozzie Smith Sports Complex: A 76-acre baseball/softball complex with seven fields, right next to CarShield Field.
  • Westhoff Park: This 65-acre park offers baseball fields, sand volleyball courts, horseshoe pits, basketball courts, tennis and handball courts, and a skate park.

Sports in O'Fallon

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CarShield Field

O'Fallon used to be home to the River City Rascals, an independent baseball team. They played at CarShield Field, which was built in 1999. The Rascals stopped playing in 2019. Now, the O'Fallon Hoots and the CarShield Collegiate League play at the stadium.

Education and Libraries

Most students in O'Fallon attend schools in the Fort Zumwalt School District. Some parts of the city are served by the Wentzville R-IV School District or the Francis Howell R-III School District.

There are also private schools in O'Fallon:

  • St. Dominic High School is a private Catholic school.
  • Christian High School is a private Christian school.

For older students, Webster University and Lindenwood University both have smaller campuses in O'Fallon.

The city's libraries are part of the St. Charles City-County Library system. There are three branches in the O'Fallon area: Deer Run, Middendorf-Kredell, and a smaller "express" location called Library Express at Winghaven.

City Services

Fire protection in O'Fallon is mainly provided by the O'Fallon Fire Protection District. In 2007, this district became the first fire agency in Missouri to be recognized internationally for its high standards. Other parts of the city are served by different fire protection districts, including Wentzville, Central County, Cottleville, New Melle, and Lake Saint Louis.

Notable People from O'Fallon

Many talented people have come from O'Fallon:

See also

Kids robot.svg In Spanish: O'Fallon (Misuri) para niños

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