Where does this demographic data come from?

All demographic data comes from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates, which samples about 3.5 million households annually. The 5-year estimates provide the most reliable data for small geographies like municipalities.

What is the difference between Census data and ACS data?

The decennial Census (conducted every 10 years) is a full population count focusing on basic demographics. The ACS is an ongoing survey that collects detailed data on income, education, housing, commute patterns, and more. ACS data is updated annually but represents averages over a 5-year period.

How accurate is this data for small towns?

For smaller municipalities, ACS estimates have wider margins of error because fewer residents are sampled. The 5-year estimates reduce this uncertainty by averaging over a longer period. For towns under 5,000 people, treat specific numbers as approximations rather than precise counts.

Lake St. Louis, MO Population, Income & Demographics 2026

Showing latest census year. Full demographic history available with a paid plan. View plans →

Demographics — 2024 ACS 5-Year Estimatesi

Census

Populationi

18,066

Median Agei

42.7

Race & Ethnicityi

White

84.7%15,303

Black

5.5%985

Two or More

4.8%869

Hispanic/Latino

2.5%453

Asian

1.9%343

Other

0.6%106

American Indian/Alaska Native

0%7

Educational Attainment (Age 25+)i

GED/Alternative

2.8%347

High School Diploma

12.2%1,527

Some College (<1 yr)

7.6%951

Some College (1+ yr)

15%1,877

Associate's Degree

7.6%952

Bachelor's Degree

34.2%4,261

Master's Degree

14.4%1,790

Professional Degree

2.2%270

Doctorate

1%130

HS or Higher

97%

BA or Higher

51.7%

Graduate+

17.6%

Housingi

Median Home Valuei

$405,900

Median Renti

$1,588

Tenure

Owner-Occupied

75.6%5,559

Renter-Occupied

24.4%1,792

Total Units

7,657

Homeownership

75.6%

Vacancy Rate

Home Values

Under $50K

0.7%39

$50K–$100K

2.2%125

$100K–$150K

0.9%50

$150K–$200K

4%220

$200K–$300K

16.4%911

$300K–$500K

45.3%2,518

$500K–$1M

28.5%1,587

$1M+

2%109

Rent Distribution

$750–$1,000

129

$1,000–$1,250

269

$1,250–$1,500

313

$1,500–$2,000

651

$2,000+

290

Year Built

2020 or later

9.8%747

2010–2019

14.8%1,133

2000–2009

25.4%1,944

1990–1999

15.4%1,177

1980–1989

15.3%1,169

1970–1979

15%1,151

1960–1969

4.3%332

1950–1959

0.1%4

Heating Fuel

Utility Gas

63.4%4,661

Electricity

34.8%2,561

Bottled/LP Gas

1.4%106

Other

0.3%23

Economyi

Median Household Incomei

$125,693

Mean Household Incomei

$155,073

Per Capita Incomei

$62,954

Poverty Ratei

4.3%

Unemploymenti

4.7%

Labor Forcei

10,014

Household Income Distribution

Under $10K

4.1%299

$10K–$15K

0.4%28

$15K–$20K

0.8%58

$20K–$25K

1.3%92

$25K–$30K

0.6%47

$30K–$35K

0.7%54

$35K–$40K

1.8%134

$40K–$45K

3.2%238

$45K–$50K

4%292

$50K–$60K

8.4%618

$60K–$75K

8.1%595

$75K–$100K

6.7%494

$100K–$125K

9.4%691

$125K–$150K

9.8%719

$150K–$200K

13.1%964

$200K+

27.6%2,028

Ancestry & Heritage

Self-reported ancestry groups. Residents may report multiple ancestries, so totals may exceed 100%.

Foreign-Born Populationi

Foreign-Borni

7224%

By Region

Top Countries

India

142

Canada

Poland

United Kingdom

Guatemala

Germany

Mexico

Philippines

Social Characteristicsi

Marital Status (15+)i

Veteransi

1,255(8.7% of civilian adults)

Health Insurancei

96.5%Insured

3.5%Uninsured