Lake St. Louis vs O'Fallon

A side-by-side comparison of Lake St. Louis and O'Fallon: population, income, housing, and more.

Lake St. Louis and O'Fallon are places in Missouri. This page compares them across population, income, housing, education, commuting, and how each has changed since 2019.

O'Fallon has the higher population (92,697 vs 17,538 in Lake St. Louis). Lake St. Louis has the higher median household income ($123,427 vs $107,203 in O'Fallon). Lake St. Louis has the higher median home value ($375,300 vs $305,100 in O'Fallon).

Population, income & housing

	Lake St. Louis	O'Fallon
Population	17,538	92,697
Median age	43.2 yrs	38.2 yrs
Median household income	$123,427	$107,203
Median home value	$375,300	$305,100
Median gross rent	$1,608	$1,400
Housing units	7,495	35,553
Homeownership rate	75.2%	80.2%
Bachelor's degree or higher	49.5%	42.4%
Unemployment rate	4.5%	2.7%

Trends (ACS 5-year, 2019–2023)

	Lake St. Louis	O'Fallon
Population	15,989 → 17,538 (+9.7%)	87,242 → 92,697 (+6.3%)
Median household income	$92,298 → $123,427 (+33.7%)	$90,025 → $107,203 (+19.1%)
Median home value	$274,400 → $375,300 (+36.8%)	$226,300 → $305,100 (+34.8%)
Median gross rent	$1,130 → $1,608 (+42.3%)	$1,103 → $1,400 (+26.9%)

Lake St. Louis

Population

15,98917,538

Median household income

$92,298$123,427

Median home value

$274,400$375,300

Median gross rent

$1,130$1,608

O'Fallon

Population

87,24292,697

Median household income

$90,025$107,203

Median home value

$226,300$305,100

Median gross rent

$1,103$1,400

Age & race/ethnicity

Age distribution (share)

	Lake St. Louis	O'Fallon
Under 5	3.2%	6.3%
5 to 17	16.8%	18.2%
18 to 24	10.3%	7.1%
25 to 34	8.7%	13.7%
35 to 44	13.2%	13.9%
45 to 54	13.2%	14.5%
55 to 64	14.9%	12.3%
65 to 74	9.9%	8.4%
75 and over	9.8%	5.5%

Race & ethnicity (share)

	Lake St. Louis	O'Fallon
White (non-Hispanic)	86.7%	81.4%
Black or African American	4.2%	5.0%
American Indian & Alaska Native	0.1%	0.1%
Asian	1.5%	4.1%
Native Hawaiian & Pacific Islander	0.0%	0.0%
Some other race	0.4%	0.5%
Two or more races	4.4%	3.8%
Hispanic or Latino	2.8%	5.1%

Educational attainment (age 25+)

Share of adults 25+

	Lake St. Louis	O'Fallon
No high school diploma	2.8%	4.5%
High school graduate	16.7%	23.0%
Some college or associate's	31.0%	30.1%
Bachelor's degree	32.4%	27.5%
Graduate or professional degree	17.1%	14.9%

Commute to work

How workers get to work (share)

	Lake St. Louis	O'Fallon
Drove alone	75.3%	77.7%
Carpooled	5.7%	4.5%
Public transit	0.0%	0.1%
Walked	0.2%	0.6%
Bicycle	0.0%	0.0%
Worked from home	18.3%	15.7%
Other means	0.5%	1.5%

Housing

Units in structure (share)

	Lake St. Louis	O'Fallon
1-unit, detached	66.9%	74.5%
1-unit, attached	12.2%	9.2%
2 to 4 units	2.9%	2.4%
5 to 19 units	14.2%	5.7%
20 or more units	3.8%	5.0%
Mobile home & other	0.0%	3.3%

Poverty & households

	Lake St. Louis	O'Fallon
Poverty rate	4.1%	4.7%
Average household size	2.44	2.66
Mean commute (minutes)	27	26
Median year structure built	1999	2000