O Fallon ZIP Code List — Saint Charles County, MO

There are 2 unique ZIP codes in O Fallon, Missouri. Area code: 636.

ZIP codes

85.50

sq mi land

1.33

sq mi water

636

area code

O Fallon, MO ZIP code map

About O Fallon, MO

O'Fallon, Missouri, is a vibrant city located in the heart of Saint Charles County. Known for its friendly community spirit and family-oriented environment, it has quickly become a popular suburb of St. Louis. With two ZIP codes, 63366 and 63368, O'Fallon offers a variety of amenities and services to its residents.

Location & geography

Geographically, O'Fallon is situated in the eastern part of Missouri, making it a convenient location for those commuting to nearby cities. It is bordered by cities such as Saint Peters, about 7 miles to the east, and Wentzville, approximately 8 miles to the west. Covering a land area of 224.07 square miles and a water area of 3.99 square miles, the city features a diverse landscape that includes parks, lakes, and recreational areas.

Community & economy

The community of O'Fallon is characterized by its welcoming atmosphere and an active involvement in local events and festivals. The city's economy is supported by various industries, with significant contributions from retail, healthcare, and manufacturing sectors. Daily life in O'Fallon features numerous parks, recreational facilities, and a thriving arts scene that fosters community connection.

Transportation

Transportation in O'Fallon is facilitated by major highways, including Interstate 70 and Highway 79, providing easy access to surrounding areas. The nearest airport is Lambert-St. Louis International Airport, which is located about 30 miles to the southeast. Public transportation options are also available for those commuting within the city and to neighboring regions.

History

O'Fallon was founded in the early 19th century and has grown significantly from its agricultural roots to become a bustling suburban community. Key industries in the area have evolved over the years, contributing to the city's robust economic landscape. Notable events in the city's history include the expansion of its infrastructure and amenities, which have attracted many new residents and businesses.

Did you know?

A surprising fact about O'Fallon is that it has been recognized as one of the fastest-growing cities in Missouri over the past few decades. Additionally, the city is home to several parks, including the large O'Fallon City Park, which features a lake and various recreational activities.

ZIP codes for O Fallon, MO (2)

ZIP code	City	County	Map
63366	O Fallon	Saint Charles	View map
63368	O Fallon	Saint Charles	View map

Demographics & statistics

98,870

Population

38.6

Median age

$103,255

Median household income

$45,983

Per capita income

$280,350

Median home value

$1,290

Median monthly rent

81.7%

Home ownership

4.9%

Poverty rate

3.4%

Unemployment

31,346

Housing units

41.8%

Bachelor's or higher

Age distribution

Male Female

3,046

Under 5

3,077

3,023

5–9

3,053

3,481

10–14

3,517

3,380

15–19

3,414

2,442

20–24

2,467

6,566

25–34

6,633

6,750

35–44

6,818

6,807

45–54

6,876

3,683

55–59

3,720

3,188

60–64

3,220

3,939

65–74

3,978

2,234

75–84

2,256

648

85+

654

← Male

Female →

Age summary

Group	Count	%
Under 18	23,874	24.3%
18 and over	74,996	75.8%
65 and over	13,709	13.8%
Median age	38.6 years

Race & ethnicity

White 82%

Two or more races 4.9%

Black or African American 4.1%

Hispanic or Latino 3.9%

Asian 3.8%

Other race 1.3%

American Indian / Alaska Native 0.1%

Group	Count	%
White	84,318	82%
Two or more races	5,023	4.9%
Black or African American	4,187	4.1%
Hispanic or Latino	3,973	3.9%
Asian	3,940	3.8%
Other race	1,305	1.3%
American Indian / Alaska Native	63	0.1%

Household income

Under $10k 2.0%

$10k–$15k 1.7%

$15k–$25k 3.6%

$25k–$35k 4.8%

$35k–$50k 9.2%

$50k–$75k 13.4%

$75k–$100k 14.3%

$100k–$150k 22.4%

$150k–$200k 16.5%

$200k+ 12.4%

Range	% of households
Under $10k	2.0%
$10k–$15k	1.7%
$15k–$25k	3.6%
$25k–$35k	4.8%
$35k–$50k	9.2%
$50k–$75k	13.4%
$75k–$100k	14.3%
$100k–$150k	22.4%
$150k–$200k	16.5%
$200k+	12.4%
Median income	$103,255

Housing

Home values

Under $50k 5.1%

$50k–$100k 0.8%

$100k–$150k 4.1%

$150k–$200k 12.1%

$200k–$300k 34.9%

$300k–$500k 36.6%

$500k–$1M 6.1%

$1M+ 0.5%

Housing overview

Metric	Value
Median home value	$280,350
Median rent / month	$1,290
Owner occupied	81.7%
Renter occupied	18.3%
Vacant	2.5%
Single-family detached	73.7%
Large apartment buildings	4.5%
Mobile homes	4.6%
Median rooms	6.5
Avg household size (owned)	2.73

Year built

Era	%
2020 or later	1.1%
2010–2019	13.6%
2000–2009	32.2%
1990–1999	29.9%
1980–1989	10.7%
1970–1979	5.4%
1960–1969	3.9%
1950–1959	1.8%
1940–1949	0.5%
1939 or earlier	1.2%

Bedrooms

Size	% of units
No bedroom (studio)	1.0%
1 bedroom	3.7%
2 bedrooms	18.1%
3 bedrooms	43.7%
4 bedrooms	29.1%
5+ bedrooms	4.7%

Vehicles per household

Vehicles	% of households
No vehicle	3.9%
1 vehicle	24.2%
2 vehicles	44.7%
3 or more	27.2%

Heating fuel

Fuel type	%
Utility gas	68.5%
Electricity	27.9%
Propane / LP gas	2.8%
Fuel oil	0.3%
Wood	0.2%
No fuel used	0.3%

Households & families

Household type	Count	%
Married-couple family	22,100	59.8%
Cohabiting couple	2,170	5.8%
Male householder, no spouse	4,974	13.3%
Female householder, no spouse	7,965	21.2%
Households with children under 18	13,635	37.0%
Households with seniors (65+)	9,939	26.6%
Average household size	2.66

Marital status

Status	Male	Female
Never married	28.9%	23.6%
Married	60.0%	56.0%
Separated	1.0%	1.0%
Widowed	2.4%	7.3%
Divorced	7.9%	12.2%

Education

Less than 9th grade 1.4%

Some HS, no diploma 3.4%

HS graduate 23.4%

Some college, no degree 21.8%

Associate's degree 8.3%

Bachelor's degree 26.5%

Graduate / professional 15.3%

Metric	%
HS diploma or higher	95.2%
Bachelor's or higher	41.8%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	1,831	7.6%
Kindergarten	1,256	5.2%
Elementary school	10,344	43.0%
High school	5,771	24.0%
College / grad school	4,871	20.3%

Employment

Industry of employment

Education & healthcare 20.5%

Professional & management 12.1%

Manufacturing 12.0%

Retail trade 11.4%

Finance & real estate 11.0%

Construction 8.0%

Arts, food & hospitality 7.8%

Other services 4.5%

Transportation & utilities 4.2%

Wholesale trade 3.2%

Public administration 3.0%

Information 1.8%

Agriculture & mining 0.9%

Occupation

Category	%
Management, business & arts	47.3%
Service	13.1%
Sales & office	23.0%
Natural resources & construction	7.8%
Production & transportation	9.0%

Employment type

Type	%
Private sector	86.5%
Government	9.6%
Self-employed	3.8%
Unpaid family workers	0.1%

Commute

Method	%
Drive alone	79.3%
Carpool	5.2%
Public transit	0.0%
Walk	0.9%
Other means	1.5%
Avg commute (minutes)	25.8

Poverty

All people 4.9%

Under 18 years 6.2%

18 and over 4.5%

Married-couple families 1.9%

Female-led households 9.6%

Income support

Source	% of households
Social Security	27.9%
Retirement income	26.1%
Supplemental Security	2.3%
Cash public assistance	1.4%
Food stamps / SNAP	4.6%

Health indicators

Condition	%
High blood pressure	24.5%
High cholesterol	30.4%
Heart disease	4.8%
Stroke	2.2%
Asthma	8.6%
Arthritis	21.4%
Kidney disease	2.1%
Pulmonary disease	5.2%
Cancer	5.8%

Behavior / access	%
Binge drinking	21.7%
No physical activity	20.3%
Less than 7 hrs sleep	32.7%
Fair or poor health	10.7%
Poor mental health	14.5%
Poor physical health	8.5%
No health insurance	12.2%
Visited doctor (checkup)	72.8%
Visited dentist	67.0%
Cholesterol screening	89.6%
Teeth loss	11.4%

Veterans & disability

Veterans	Count	%
Civilian veterans	5,388	7.1%

Disability	%
Any disability	10.3%
Under 18	3.7%
18–64 years	8.5%
65 and over	30.5%

Health insurance coverage

Type	%
Private insurance	83.7%
Public insurance	20.7%
Uninsured under 19	3.8%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	92,747	93.8%
Spanish	1,923	2.1%
Other Indo-European	720	0.8%
Asian & Pacific Islander	307	0.4%
Other languages	873	1.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	93,751	94.8%
Born in same state	93,067	94.1%
Born in different state	67,439	68.2%
Foreign born	684	0.7%
Naturalized citizen	5,119	5.3%
Not a US citizen	3,099	62.1%

Ancestry

Ancestry	Count	%
Italian	13,639	13.8%
French	10,520	10.6%
Arab	6,366	6.4%
English	1,004	1%
Polish	609	0.6%

Ancestry	Count	%
German	375	0.4%
Dutch	232	0.2%
Irish	219	0.2%
Norwegian	122	0.1%

Technology access

Metric	% of households
Computer access	37.6%
Internet access	96.5%

Source: U.S. Census Bureau, American Community Survey 2025 estimates.

Frequently asked questions

What ZIP codes does O Fallon, MO have?

O Fallon, MO has 4 ZIP codes: 63366, 63366, 63366, 63368. Each ZIP code serves a distinct delivery area within the city and surrounding region.

What is the main ZIP code for O Fallon, MO?

The primary ZIP code for O Fallon, MO is 63366. The city uses area code 636 for phone service.

What county is O Fallon, MO in?

O Fallon is located in Saint Charles County, Missouri.

How many ZIP codes are in O Fallon, MO?

O Fallon, MO has 4 ZIP codes.

What ZIP code covers the downtown O Fallon area and Old Town district?

The downtown O Fallon area, including Old Town near the historic town center, is primarily served by ZIP code 63366.

Which ZIP code serves the southern residential neighborhoods of O Fallon near the Saint Charles County border?

The southern residential areas of O Fallon, extending toward the county boundaries, are served by ZIP code 63368.