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.

O'Fallon, 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

32,262

Median Agei

37.8

Race & Ethnicityi

White

69.4%22,382

Black

16.5%5,335

Two or More

5.8%1,881

Hispanic/Latino

5.1%1,661

Asian

2.6%833

Other

0.4%145

American Indian/Alaska Native

0.1%25

Educational Attainment (Age 25+)i

GED/Alternative

2.5%539

High School Diploma

14.4%3,148

Some College (<1 yr)

4.6%1,002

Some College (1+ yr)

13.1%2,869

Associate's Degree

10.7%2,344

Bachelor's Degree

29%6,349

Master's Degree

19.9%4,358

Professional Degree

2.3%500

Doctorate

1.2%262

HS or Higher

97.6%

BA or Higher

52.4%

Graduate+

23.4%

Housingi

Median Home Valuei

$295,700

Median Renti

$1,332

Tenure

Owner-Occupied

70.2%8,997

Renter-Occupied

29.8%3,819

Total Units

13,530

Homeownership

70.2%

Vacancy Rate

5.3%

Economyi

Median Household Incomei

$105,982

Mean Household Incomei

$136,093

Per Capita Incomei

$54,265

Poverty Ratei

6.2%

Unemploymenti

3.5%

Labor Forcei

16,312

Household Income Distribution

Under $10K

3%379

$10K–$15K

2%252

$15K–$20K

1.9%241

$20K–$25K

2.7%349

$25K–$30K

2.9%374

$30K–$35K

2.2%277

$35K–$40K

1.9%241

$40K–$45K

1.4%177

$45K–$50K

3.6%462

$50K–$60K

6.6%850

$60K–$75K

8.8%1,129

$75K–$100K

10.7%1,377

$100K–$125K

11%1,404

$125K–$150K

9.1%1,166

$150K–$200K

12%1,538

$200K+

20.3%2,600

Federally Subsidized Housingi

HUD

The federal government helps low-income families, seniors, and people with disabilities afford housing through several programs. Residents typically pay about 30% of their income toward rent, with the government covering the rest. This data shows how many households in this community receive that assistance.

Subsidized Homesi

326

Residentsi

499

Avg. Tenant Renti

$390/mo

Programs in this community

Housing Choice Vouchers30 homes81% occupied$456/mo rent

Rental vouchers (Section 8) that help tenants pay for private-market housing

Project Based Section 8182 homes96% occupied$379/mo rent

Privately owned apartments with rent subsidies tied to the building

Household Incomei

Based on area median of $105,982/yr

Extremely low incomeUnder $32K/yr

83%

Very low income$32K–$53K/yr

16.1%

Low income$53K–$85K/yr

0.9%

Who Receives This Housing

68.4% of subsidized households are headed by a single mother

63.8% of subsidized households are minority

15% of subsidized households include someone with a disability

77.7% of subsidized households include a senior (62+)

Ancestry & Heritage

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

Social Characteristicsi

Marital Status (15+)i

Veteransi

4,679(20.2% of civilian adults)