All ZIP Codes, Map and Demographics of O Fallon, MO

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O Fallon spans 4 ZIP Codes - enter an address to find the correct one.

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Data Last Updated: March 1, 2026
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ZIP Codes:4 Standard, 0 PO Box [See All]
County:Saint Charles County, MO
Area Code:636
Time Zone:Central (GMT -06:00)
Local Time:12:00:00 AM
Population:202,941 (ZIP Codes) [More Demographics]
Statistical Area:St. Louis, MO-IL [Learn More]
Coordinates:38.8346, -90.7213
Land Area:138.59 sq miles (ZIP Codes)
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O Fallon, MO has 4 ZIP Codes

ZIP CodeTypePopulationPop% of Population% of PopAlias Names
63366Standard53,86126.54%Cottleville,Dardenne,Dardenne Pr,Dardenne Prairie,Ofallon,Saint Paul,Saint Peters,St Peters
63367Standard27,00913.31%Lake St Louis,Lsl,O Fallon,Ofallon
63368Standard46,00722.67%Dardenne,Dardenne Pr,Dardenne Prairie,Ofallon
63376Standard76,06437.48%Cottleville,O Fallon,St Peters
99,868 people in O Fallon, MO — get this data and hundreds of fields for every U.S. ZIP code View Database Try API
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Population & Demographics

Data labeled as "All ZIP Codes" is a total (or average) for every ZIP Code with O Fallon, MO assigned by the USPS. The U.S. Postal Service provides a name (and aliases) for every ZIP Code which can include cities, towns, villages, and other incorporated names.

There is currently no matching U.S. Census Place for this geographic area. Many rural areas may have such low population density that they will not be part of any U.S. Census Place.

Total Population:99,868
Total Households:36,780
Total Housing Units:79,181
Average Household Size:2.64
Average Family Size:2.76

All ZIP Codes assigned this City name by the USPS.

Population Over Time (with 2010 & 2020 Census Benchmarks)

Line chart of All ZIPs in O Fallon, MO population estimates from 2011-2024, with markers for the 2010 and 2020 Decennial Census counts to show growth or decline over time. Chart loads automatically and replaces this content. Load Chart Manually (if needed)
Group20102011210220132014201520162017201820192020202120222023
Census ACS Population Estimate--177,010180,924183,103185,764187,721190,178192,965195,136196,748197,803199,024201,208203,080
Decennial Census179,796------------------202,941------
Source: U.S. Census 2011-2023 American Community Survey 5-Year Estimates. DP05. DEMOGRAPHIC AND HOUSING ESTIMATES

Population by Age & Gender (Total, Male, Female)

Median Age: 38.6

Male Median Age: 37.3

Female Median Age: 39.8

Line Chart showing the population by Age Group and Gender of all ZIPs in O Fallon, Missouri. One line shows the Total population in that age group, another line shows the Male population for that age group, and the last line shows the Female population for the given age group. A table also provides the same information. Chart loads automatically and replaces this content. Load Chart Manually (if needed)
Group< 55-910-1415-1920-2425-2930-3435-3940-4445-4950-5455-5960-6465-6970-7475-7980-8485+
Male5,7816,9387,5357,3795,6485,3756,4527,0966,6906,5636,4787,0236,2554,7563,7872,4861,5461,208
Female5,6596,6017,1516,9555,1775,3806,6527,3476,9196,9866,7327,5186,8335,7634,7193,2042,1872,162
Total11,44013,53914,68614,33410,82510,75513,10414,44313,60913,54913,21014,54113,08810,5198,5065,6903,7333,370
Source: U.S. Census Bureau (2020) Demographics & Housing Characteristics (DHC)
Pie Chart & Table (ZIPs)Comparison Chart

Population by Race

Pie Chart showing Population by Race for all ZIPs in O Fallon, Missouri. Chart loads automatically and replaces this content. Load Chart Manually (if needed)
White:82,67385.00%
Black:4,8114.95%
Hispanic:*4,0774.19%
Asian:3,7973.90%
American Indian:2180.22%
Hawaiian:1020.10%
Other:1,5871.63%
Total:97,265100%

All ZIP Codes assigned this City name by the USPS.

Source: U.S. Census Bureau (2020) Demographics & Housing Characteristics (DHC)
* NOTE: Hispanic or Latino is an ethnicity, not a race. This means individuals who identify as Hispanic will also be included in one of the race categories (such as White or Black). As a result, the totals shown here may exceed 100% when Hispanic is displayed alongside racial groups.
Pie Chart & Table (ZIPs)Comparison Chart

Gender Breakdown

Pie chart showing Male vs Demale share of the population. Chart loads automatically and replaces this content. Load Chart Manually (if needed)
GenderCountPercentageMedian Age
Males:48,47248.54%37.3 years
Females:51,39651.46%39.8 years
Total:99,868100%38.6 years

All ZIP Codes assigned this City name by the USPS.

Source: U.S. Census Bureau (2020) Demographics & Housing Characteristics (DHC)
Pie Chart & Table (ZIPs)

Nativity & Citizenship

Native, born in the United States:192,96095.02%
Native, born in PR, Island Areas, or abroad:1,6190.80%
Foreign born, naturalized U.S. citizen:5,0642.49%
Foreign born, not a U.S. citizen:3,4374.19%
Total Population:203,080100%
Total Native Population:194,57995.81%
Total Foreign-born Population:8,5014.19%
Source: U.S. Census 2019-2023 American Community Survey 5-Year Estimates. Table DP02. SELECTED SOCIAL CHARACTERISTICS
Note: Nativity and Citizenship derived from American Community Survey (ACS) 5-year estimates. Total Population listed here will not match official ZIP Code population totals, which are based on the Decennial Census.

Income & Employment

Median Income Over Time (Household, Family, Nonfamily, Male, Female)

Line Chart showing Median Income Estimates from 2011 until 2024 of Median Household Income, Median Family Income, Median Nonfamily Income, Median Male Income, and Median Female Income for all ZIPs in O Fallon, Missouri. A table also provides the same information. Chart loads automatically and replaces this content. Load Chart Manually (if needed)
Income Type2011210220132014201520162017201820192020202120222023
Median Household Income$76,841$77,598$77,400$77,569$77,977$80,936$84,522$87,240$90,530$94,562$98,794$108,241$111,725
Median Family Income$90,678$91,491$90,673$91,599$91,571$93,119$97,133$100,618$103,962$107,489$113,906$123,572$129,811
Median NonFamily Income$43,157$43,881$43,485$43,725$44,566$45,858$46,092$45,962$47,958$47,556$50,100$54,577$56,952
Median Male Income$61,577$63,267$64,555$64,208$62,753$62,551$65,731$66,766$68,182$70,259$73,636$78,164$79,684
Median Female Income$42,666$43,096$43,911$45,279$45,079$45,394$46,564$48,511$50,069$52,173$57,005$62,184$64,782
Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. DP03. SELECTED ECONOMIC CHARACTERISTICS

Average Household Income

Bar Chart showing Average Household Income for all ZIPs in O Fallon, MO, the U.S. Census Place, Saint Charles County, the state of Missouri, and the United States National Average. Chart loads automatically and replaces this content. Load Chart Manually (if needed)
Source: U.S. Census 2019-2024 American Community Survey 5-Year Estimates. Table DP03. SELECTED ECONOMIC CHARACTERISTICS
Pie Chart & Table (ZIPs)Comparison Chart

Employment Status

Employment status for all ZIPs in O Fallon, MO: employed, unemployed, and not in the labor force. Chart loads automatically and replaces this content. Load Chart Manually (if needed)
Employed:111,35668.89%
Unemployed:3,4082.11%
Not In Labor Force:46,87229.00%
Total:161,636100%

All ZIP Codes assigned this City name by the USPS.

Source: U.S. Census 2019-2023 American Community Survey 5-Year Estimates. Table DP03. SELECTED ECONOMIC CHARACTERISTICS
Pie Chart & Table (ZIPs)

Employment by Occupation (Civilian Employed Population, 16 and Over)

Management, business, science, and arts:51,26046.03%
Service:14,58213.09%
Sales and Office:25,32222.74%
Natural resources, construction, and maintenance:8,0527.23%
Production, transportation, and material moving:12,14010.90%
Total Civilian Employed Population:111,356100%
Source: U.S. Census 2019-2023 American Community Survey 5-Year Estimates. Table DP03. SELECTED ECONOMIC CHARACTERISTICS.

Housing & Affordability

Median Home Value (Comparison)

Bar Chart showing median House Value for all ZIPs in O Fallon, Missouri, the U.S. Census Place, Saint Charles County, Missouri, and the United States National Average. Chart loads automatically and replaces this content. Load Chart Manually (if needed)
Source: U.S. Census 2019-2023 American Community Survey 5-Year Estimates. Table DP03. SELECTED ECONOMIC CHARACTERISTICS

Median Home Value Over Time (2011-2024)

Group2011210220132014201520162017201820192020202120222023
Median Home Value$206,700$202,450$198,100$195,800$194,450$201,100$209,000$217,900$226,200$236,500$247,300$280,350$305,800
Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. DP04. SELECTED HOUSING CHARACTERISTICS
Pie Chart & Table (ZIPs)

Gross Rent Paid

Less than $500:2872.02%
$500 to $999:2,32216.34%
$1,000 to $1,499:5,59039.34%
$1,500 to $1,999:3,53324.86%
$2,000 to $2,499:1,0537.41%
$2,500 to $2,999:2481.75%
$3,000 or more:3372.37%
No Rent:8395.90%
Total:14,209100%

All ZIP Codes assigned this City name by the USPS.

Source: U.S. Census 2019-2023 American Community Survey 5-Year Estimates. Table Table DP04. SELECTED HOUSING CHARACTERISTICS

Median Gross Rent Over Time (2011-2024)

Group2011210220132014201520162017201820192020202120222023
Median Rent$915$954$995$1,007$1,025$1,043$1,090$1,116$1,117$1,127$1,158$1,289$1,358
Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. DP04. SELECTED HOUSING CHARACTERISTICS
Pie Chart & Table (ZIPs)

Housing Occupancy

Owner Occupied (with mortgage): 46,802 60.16%
Owner Occupied (free and clear, no mortgage): 16,786 21.58%
Renter Occupied: 14,209 18.26%
Total Occupied Housing Units: 77,797 100%
Occupied Housing Units: 77,797 97.10%
Vacant Housing Units (not graphed): 2,324 2.90%
Total Housing Units: 80,121 100%
Source: U.S. Census 2019-2023 American Community Survey 5-Year Estimates. Table DP04. SELECTED HOUSING CHARACTERISTICS

Education, Health & Community

Pie Chart & Table (ZIPs)

Educational Attainment of Adults (25 and Older)

Less than 9th grade:1,8271.30%
9th to 12th grade, no diploma:4,0982.92%
High school graduate (includes equivalency):32,29423.02%
Some college, no degree:31,44422.41%
Associate's degree:12,7569.09%
Bachelor's degree:36,93026.32%
Graduate or professional degree:20,95314.93%
Total:140,302100%
High school graduate or higher:134,37795.78%
Bachelor's degree or higher:57,88341.26%

All ZIP Codes assigned this City name by the USPS.

Source: U.S. Census 2019-2023 American Community Survey 5-Year Estimates. Table DP02. SELECTED SOCIAL CHARACTERISTICS
Pie Chart & Table (ZIPs)Comparison Chart

Health Insurance Coverage by Type (Private, Public, Uninsured)

Private Insurance:170,17876.14%
Public Insurance:44,90520.09%
No Insurance:8,4183.77%
Total:223,501100%
Has Health Insurance:215,08396.23%

All ZIP Codes assigned this City name by the USPS.

Source: U.S. Census 2019-2023 American Community Survey 5-Year Estimates. Table DP03. SELECTED ECONOMIC CHARACTERISTICS

Percentage of People in Poverty Over Time (2011-2024)

Group2011210220132014201520162017201820192020202120222023
% of People in Poverty3.5%4.0%4.7%4.9%4.5%3.9%3.4%3.5%3.2%2.9%3.4%3.0%2.9%
Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. DP03. SELECTED ECONOMIC CHARACTERISTICS

Note: Counts of Families & People in poverty are not published at the ZIP Code level due to small sample sizes. Percentages shown are survey estimates from the American Community Survey (ACS). They may differ from official poverty statistics. The U.S. Census Bureau defines poverty status by comparing a family's or individual's total income with federal poverty thresholds that vary by family size and composition.

Pie Chart & Table (ZIPs)

School Enrollment by Education Level (Ages 3 and Older)

Nursery School, Preschool:3,7827.78%
Kindergarten:2,5965.34%
Elementary school (grades 1-8):21,17543.58%
High school (grades 9-12):11,49423.66%
College or graduate school:9,53919.63%
Total:48,586100%
Early Childhood:6,37813.13%
K-12 (Primary & Secondary School):35,26572.58%
Source: U.S. Census 2019-2023 American Community Survey 5-Year Estimates. Table DP02. SELECTED SOCIAL CHARACTERISTICS

Business & Employment Statistics

O Fallon supports both business and residential activity. According to the Business Census (2024), there are 2,023 business establishments, employing about 35,148 people with an annual payroll of $2,626,942,000. USPS data shows 39,603 residential mailboxes and 1,924 business mailboxes, reflecting local delivery coverage.

# Residential Mailboxes:39,603Source: USPS
# Business Mailboxes:1,924Source: USPS
Total Delivery Receptacles:44,196Source: USPS
Single Family Delivery Units:30,073Source: USPS
Multi Family Delivery Units:3,264Source: USPS
# of Businesses:2,023Source: CBP
1st Quarter Payroll:$827,071,000Source: CBP
Annual Payroll:$2,626,942,000Source: CBP
# of Employees:35,148Source: CBP

All ZIP Codes assigned this City name by the USPS.

Geography, Land Area, and Statistical Classifications

O Fallon, MO is located in Saint Charles County, within the St. Louis, MO-IL Metropolitan Statistical Area (CBSA 41180). It spans 6 of Missouri's Congressional Districts (1st,2nd,3rd,12nd,13rd, and 15th). This Metro area has a population of 2,809,414 people, about 7.2% of whom live in O Fallon. ZIP Codes here cover 138.589 sq mi of land and a water area of 2.154 sq mi.

CBSA Name:St. Louis, MO-ILSource: Census
CBSA Number:41180Source: Census
CBSA Type:MetroSource: Census
CBSA Division:--Source: Census
CBSA Population:2,809,414Source: Census
MSA:St. Louis, MO-IL MSASource: Census
PMSA:--Source: Census
Land Area:138.589 sq miSource: Census
Water Area:2.154 sq miSource: Census
Congressional District(s):01,02,03,12,13,15Source: USPS
Intro Date:< 2004-10Source: ZIP-Codes.com
Last ZIP Intro:2005-07Source: ZIP-Codes.com
Place FIPS Code:--Source: Census
Place Name:--Source: Census

Sum of all ZIP Codes assigned this City name by the USPS.

Adjacent & Nearby Cities from O Fallon, MO

  1. Lake Saint Louis, MO ~5.7 miles
  2. Saint Peters, MO ~5.8 miles
  3. Old Monroe, MO ~7.1 miles
  4. Wentzville, MO ~7.5 miles
  5. Golden Eagle, IL ~8.7 miles
  6. Saint Charles, MO ~9.1 miles
  7. Winfield, MO ~11.8 miles
  8. Moscow Mills, MO ~11.9 miles
  9. Foristell, MO ~12.3 miles
  10. Defiance, MO ~12.5 miles
  11. Brussels, IL ~12.5 miles
  12. Chesterfield, MO ~14.1 miles
  13. Earth City, MO ~14.4 miles
  14. Maryland Heights, MO ~16.0 miles
  15. Saint Louis, MO ~16.4 miles
  16. Foley, MO ~16.5 miles
  17. Bridgeton, MO ~16.8 miles
  18. Wildwood, MO ~17.3 miles
  19. Wright City, MO ~17.6 miles
  20. Troy, MO ~18.0 miles

Sources & References

Our sources include trusted federal and licensed data from the United States Postal Service, U.S. Census Bureau, U.S. Geological Survey, Centers for Medicare & Medicaid Services, and the National Center for Education Statistics, along with proprietary datasets created by ZIP-Codes.com. Data last updated on March 1, 2026.

  1. U.S. Postal Service [Last Updated: 3/1/2026], https://www.usps.com
  2. ZIP-Codes.com Proprietary Data Enhancements [Updated: 3/1/2026], https://www.zip-codes.com
  3. U.S. Census [Updated: Varies], https://www.census.gov
    • U.S. Census Office of Management and Budget [Updated: As Released]
    • U.S. Census 2020 Demographic & Housing Characteristics (DHC) [Decennial] [Updated: 5/25/2023]
    • U.S. Census 2011-2024 American Community Survey 5-year estimates (ACS) [Annually] [Updated: Annually, As Released]
    • U.S. Census Business Patterns [Annually] [Updated: Annually, As Released]
    • U.S. Census American National Standards Institute (ANSI) [Updated: As Released]
  4. U.S. Geological Survey [Updated: Varies], https://www.usgs.gov
  5. Centers for Medicare & Medicaid Services [Updated: Annually, As Released], https://www.cms.gov
  6. National Center for Education Statistics [Updated: 3/1/2026], https://nces.ed.gov