O'Fallon Population

1880–2026

96,958

2026 projection

5.8% since 2020 (increase)

020K40K60K80K100K18801900192019401960198020002020

Source: U.S. Census Bureau decennial counts and annual estimates. 2026 is a projection. Values between recorded years are interpolated.

Use the left and right arrow keys to inspect population observations.

Population by year

Population estimates for O'Fallon. Annual change is shown as a percentage. Growth is the total change since the preceding observation.
202696,958+8570.89%
202596,101+9981.05%
202495,103+7950.84%
202394,308+5590.60%
202293,749-140.01%
202193,763+2,0902.28%
202091,673+3,0783.47%
201988,595+2450.28%
201888,350+8120.93%
201787,538+1,0391.20%

Showing 10 of 27 years.

O'Fallon Demographics

38.4median age

Median age

Female39.2 yrs
Male37.8 yrs

Adults

71,125
13,569 seniors · 19%57,556 other adults

Sex

Female 51.2% · 48,041Male 48.8% · 45,760

Population by age

MaleFemale85+ years, male: 51785+ years, female: 98980–84 years, male: 52280–84 years, female: 61675–79 years, male: 1,15175–79 years, female: 1,59370–74 years, male: 1,54870–74 years, female: 1,90565–69 years, male: 2,00165–69 years, female: 2,72760–64 years, male: 2,99360–64 years, female: 2,39355–59 years, male: 2,57355–59 years, female: 3,44350–54 years, male: 3,58750–54 years, female: 3,68445–49 years, male: 3,11145–49 years, female: 2,91440–44 years, male: 3,29340–44 years, female: 3,35235–39 years, male: 3,55435–39 years, female: 3,23730–34 years, male: 3,05530–34 years, female: 3,60325–29 years, male: 3,06025–29 years, female: 3,21520–24 years, male: 2,19220–24 years, female: 2,29415–19 years, male: 3,29015–19 years, female: 3,17410–14 years, male: 3,17210–14 years, female: 3,1815–9 years, male: 2,9295–9 years, female: 3,1750–4 years, male: 3,2120–4 years, female: 2,54685+80–8475–7970–7465–6960–6455–5950–5445–4940–4435–3930–3425–2920–2415–1910–145–90–41K1K2K2K3K3K

Hover or tap an age group to see exact counts. Use the up and down arrow keys to inspect age groups.

U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101

Race and ethnicity

Tap a square or a group below to highlight it.

Each square is about 1% of residents (roughly 938 people).

Hispanic or Latino residents can be of any race. All other groups exclude Hispanic residents.

U.S. Census Bureau, 2024 ACS 5-year estimates · Table B03002

O'Fallon Income

$110,443median household income

Median household income

$110,443

Half of households earn more, half earn less

Median earnings

$66,095

Typical yearly pay for a worker 25 or older.

Poverty rate

5.4%

About 1 in 19 residents

U.S. Census Bureau, 2024 ACS 5-year estimates · Tables S1901, S1501, S1701

O'Fallon Marital Status

56% of residents age 15 and older are married.

MarriedNever married
Overall
Male
Female
Marital status of residents age 15 and older
StatusOverallMaleFemale
Married56%59%53%
Never married27%29%25%
Divorced11%9%13%
Widowed5%2%8%
Separated1%1%1%

U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201

Sources

10 sources, all from the U.S. Census Bureau

Population

American Community Survey, 2024 5-year