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Missouri ZIP Codes
Saint Charles County
O Fallon, MO
63366
63366 ZIP Code — O Fallon, MO
Saint Charles County, Missouri
ZIP code 63366 is located in
O Fallon ,
Missouri ,
within Saint Charles County .
It covers approximately 69.28 square miles and serves a population of
52,746 residents.
This is a standard ZIP code in the Central (CT) timezone,
served by area code 636 .
About ZIP code 63366
The housing stock consists of predominantly single-family detached homes. Most homes were built in the 2000s, giving the area an established character. Median home value is $262,500. Owner-occupancy is high at 81%, well above the national average.
Median household income is $91,698. The poverty rate of 6% is below the national average. 31% of households receive Social Security income, suggesting a notable retiree or disability population.
The dominant occupation class is management, business, and professional, with education and healthcare as the leading industry. The average commute of 25 minutes is near the national average.
Educational attainment is near the national average, with 35% of residents holding a bachelor's degree or higher.
Overall, ZIP code 63366 reflects a community defined by high homeownership and a significant Social Security-dependent population.
63366 ZIP code map
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Cities in ZIP code 63366
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Nearby ZIP codes
Demographics
updated 05/2026
Population
Total population
52,746
Population density
761 / sq mi
State FIPS
29
County FIPS
183
Geography
Land area
69.28 sq mi
Water area
1.33 sq mi
Latitude
38.8535
Longitude
-90.7027
Timezone
Central (CT)
Area code
636
Economics
updated 05/2026
Household income
Income range
This ZIP
County avg
State avg
Under $50k
27.1%
24.9%
43.8%
$50k – $100k
34.1%
32.4%
31.5%
$100k – $200k
31.7%
33.0%
19.5%
Over $200k
7.1%
9.7%
5.2%
Demographics & statistics
$91,698
Median household income
$262,500
Median home value
$1,194
Median monthly rent
34.6%
Bachelor's or higher
Age distribution
Age summary
Group Count % Under 18 11,838 22.4% 18 and over 40,908 77.6% 65 and over 7,845 14.9% Median age 39.7 years
Race & ethnicity
Black or African American
4.2%
Group Count % White 45,167 81.4% Two or more races 3,044 5.5% Hispanic or Latino 2,735 4.9% Black or African American 2,342 4.2% Asian 1,415 2.6% Other race 751 1.4%
Household income
Income range
This ZIP
County avg
State avg
Under $50k
27.1%
24.9%
43.8%
$50k – $100k
34.1%
32.4%
31.5%
$100k – $200k
31.7%
33.0%
19.5%
Over $200k
7.1%
9.7%
5.2%
Range % of households Under $10k 2.6% $10k–$15k 2.1% $15k–$25k 4.2% $25k–$35k 5.7% $35k–$50k 10.3% $50k–$75k 15.8% $75k–$100k 14.1% $100k–$150k 21.3% $150k–$200k 15.4% $200k+ 8.4% Median income $91,698
Housing
Housing overview
Metric Value Median home value $262,500 Median rent / month $1,194 Owner occupied 80.9% Renter occupied 19.1% Vacant 2.7% Single-family detached 73.5% Large apartment buildings 3.3% Mobile homes 5.4% Median rooms 6.0 Avg household size (owned) 2.66
Year built
Era % 2020 or later 1.6% 2010–2019 15.2% 2000–2009 28.5% 1990–1999 22.8% 1980–1989 12.5% 1970–1979 7.2% 1960–1969 7.1% 1950–1959 3.3% 1940–1949 0.8% 1939 or earlier 1.0%
Bedrooms
Size % of units No bedroom (studio) 0.5% 1 bedroom 3.0% 2 bedrooms 20.6% 3 bedrooms 49.6% 4 bedrooms 23.3% 5+ bedrooms 3.1%
Vehicles per household
Vehicles % of households No vehicle 4.1% 1 vehicle 26.1% 2 vehicles 44.0% 3 or more 25.8%
Heating fuel
Fuel type % Utility gas 63.7% Electricity 30.5% Propane / LP gas 4.9% Fuel oil 0.4% Wood 0.4% No fuel used 0.1%
Households & families
Household type Count % Married-couple family 11,411 56.0% Cohabiting couple 1,242 6.1% Male householder, no spouse 2,941 14.4% Female householder, no spouse 4,784 23.5% Households with children under 18 6,858 33.7% Households with seniors (65+) 5,820 28.6% Average household size 2.58
Marital status
Status Male Female Never married 29.6% 22.6% Married 58.1% 54.3% Separated 1.0% 0.8% Widowed 2.0% 7.7% Divorced 9.3% 14.6%
Education
Some college, no degree
23.4%
Graduate / professional
12.1%
Metric % HS diploma or higher 94.1% Bachelor's or higher 34.6%
School enrollment (ages 3–17)
Type Count % Nursery / preschool 1,021 8.5% Kindergarten 578 4.8% Elementary school 5,228 43.4% High school 2,843 23.6% College / grad school 2,382 19.8%
Employment
Industry of employment
Education & healthcare
20.7%
Professional & management
10.9%
Finance & real estate
9.1%
Arts, food & hospitality
7.4%
Transportation & utilities
4.2%
Public administration
2.7%
Agriculture & mining
1.4%
Occupation
Category % Management, business & arts 43.3% Service 12.9% Sales & office 24.6% Natural resources & construction 10.0% Production & transportation 9.3%
Employment type
Type % Private sector 87.2% Government 9.4% Self-employed 3.3% Unpaid family workers 0.0%
Commute
Method % Drive alone 79.9% Carpool 5.2% Public transit 0.0% Walk 1.2% Work from home 12.5% Other means 1.3% Avg commute (minutes) 25.1
Poverty
Married-couple families
2.0%
Female-led households
11.4%
Income support
Source % of households Social Security 31.1% Retirement income 26.3% Supplemental Security 3.1% Cash public assistance 2.2% Food stamps / SNAP 5.7%
Health indicators
Condition % Obesity 31.7% High blood pressure 25.8% High cholesterol 31.0% Diabetes 7.6% Heart disease 5.2% Stroke 2.4% Asthma 8.8% Arthritis 22.7% Kidney disease 2.3% Pulmonary disease 5.8% Cancer 6.0%
Behavior / access % Smoking 17.4% Binge drinking 21.5% No physical activity 21.9% Less than 7 hrs sleep 33.1% Depression 23.4% Fair or poor health 11.9% Poor mental health 15.0% Poor physical health 9.2% No health insurance 13.2% Visited doctor (checkup) 72.9% Visited dentist 64.7% Cholesterol screening 88.9% Teeth loss 12.8%
Veterans & disability
Veterans Count % Civilian veterans 3,192 7.8%
Disability % Any disability 11.9% Under 18 4.0% 18–64 years 10.2% 65 and over 31.2%
Health insurance coverage
Type % Private insurance 81.3% Public insurance 24.0% No insurance 6.0% Uninsured under 19 3.5%
Language & origin
Language spoken at home (age 5+)
Language Count % English only 49,684 94.2% Spanish 937 1.9% Other Indo-European 423 0.9% Asian & Pacific Islander 86 0.2% Other languages 420 0.8%
Place of birth & citizenship
Origin Count % Native born (US) 50,496 95.7% Born in same state 50,077 94.9% Born in different state 36,480 69.2% Foreign born 419 0.8% Naturalized citizen 2,250 4.3% Not a US citizen 1,688 75.0%
Ancestry
Ancestry Count % Italian 7,020 13.3% French 5,603 10.6% Arab 4,230 8% English 633 1.2% Polish 238 0.5%
Ancestry Count % Dutch 213 0.4% Irish 112 0.2% German 94 0.2% Norwegian 28 0.1%
Technology access
Metric % of households Computer access 38.6% Internet access 96.0%
Source: U.S. Census Bureau, American Community Survey 2025 estimates.
Frequently asked questions about ZIP code 63366
What part of O Fallon is ZIP code 63366?
ZIP code 63366 covers a portion of O Fallon, Missouri, within Saint Charles County.
What county is ZIP code 63366 in?
ZIP code 63366 falls within Saint Charles County, Missouri.
Is ZIP code 63366 mostly owner-occupied?
81% of occupied units in ZIP code 63366 are owner-occupied, well above the national average.
What is the population of ZIP code 63366?
ZIP code 63366 has an estimated population of 52,746 residents, with a density of 761 people per square mile.
What is the median household income in ZIP code 63366?
The median household income in ZIP code 63366 is $91,698, above the national median of ~$75,000.
What is the typical home value in ZIP code 63366?
The median home value in ZIP code 63366 is $262,500.
What timezone is ZIP code 63366 in?
ZIP code 63366 observes the CST timezone.
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