ZIP Code 63366
standardSource:
O Fallon · St. Charles County · Missouri
- Population
- 46,175
- Median income
- $100,621
- Median home value
- $304,500
- Bachelor's or higher
- 33.3%
- Land area
- 178.1 sq mi
259/sq mi
▲ 32% vs US
higher than 81% of US ZIPs
▲ 9% vs US
higher than 67% of US ZIPs
Median age 40.4
Chicago
ZIP code 63366 in O Fallon, Missouri has a population of 46,175. The median household income is $100,621, which is 32% above the national average. Median home value is $304,500, 9% above the US average. 33.3% of residents hold a bachelor's degree or higher.
ZIP code 63366 is classified by USPS as a standard delivery area and covers roughly 178.1 square miles in O Fallon, St. Charles County, Missouri. The area is home to 46,175 residents, producing a population density of 259 people per square mile, and falls within the Chicago time zone. These USPS and Census boundary values drive every downstream statistic on this page, including the benchmarks that compare 63366 against Missouri and the nation.
On the economic side, the median household income for ZIP 63366 sits at $100,621 (51% above the Missouri average), while per-capita income is $45,718. The poverty rate stands at 7.0% and the unemployment rate at 3.5%. On housing, the median home value is $304,500 (59% above the state average) with median rent at $1,302 per month, and 82.1% of occupied units are owner-occupied, a direct signal of whether 63366 behaves more like a homeowner neighborhood or a renter-heavy ZIP.
Education and household profile round out the picture: 33.3% of adults hold a bachelor's degree or higher, the median age is 40.4, and the average commute is 25 minutes. We also surface 7 nearby ZIP codes within roughly 10 miles and 6 additional ZIPs sharing St. Charles County, so you can benchmark 63366 against its immediate geography rather than a national average alone. Every figure is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates, HUD Fair Market Rents, and FHFA Home Price Index data, no estimates, no proprietary scoring. Verify with HUD →
Top industries in ZIP 63366
Top 5 sectors by establishment count
Which industries have the most business establishments in ZIP 63366.
- Construction
Construction
173 establishments
- Retail trade
Retail trade
146 establishments
- Health care and social assistance
Health care and social assistance
130 establishments
- Accommodation and food services
Accommodation and food services
119 establishments
- Other services (except public administration)
Other services (except public administration)
113 establishments
What this shows Establishment counts come from the Census ZIP Code Business Patterns program, which counts physical business locations rather than employees or revenue.
Source: U.S. Census Bureau, American Community Survey 5-Year Estimates + ZIP Code Business Patterns + HUD FMR + FHFA HPI ACS demographics, ZBP business establishments, HUD Fair Market Rents, FHFA HPI for ZIP 63366, O Fallon, MO · 2023 Census ACS 5-Year Estimates use a rolling 60-month sample for stable small-geography estimates; ZBP updated annually; HUD FMR + FHFA HPI updated quarterly/annually.
Quick Facts
46,175
Population
178.1
Area (sq mi)
259
People / sq mi
Chicago
Time Zone
standard
ZIP Type
Who lives in ZIP 63366?
40.4
Median Age
49.8%
Male
50.2%
Female
5.5%
Foreign-Born
Hispanic or Latino is an ethnicity category from the Census Bureau and may overlap with other categories above.
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
How much do residents earn?
$100,621
Median Household Income
+51% vs state
$45,718
Per Capita Income
7.0%
Poverty Rate
3.5%
Unemployment Rate
24.9 min
Mean Commute Time
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
What is the education profile here?
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
What does housing look like?
21,514
Total Housing Units
20,967
Occupied Units
547
Vacant Units
2.60
Avg Household Size
Occupancy Type
$304,500
Median Home Value
+59% vs state
$1,302
Median Rent
1998
Median Year Built
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
How have home values changed over time?
FHFA House Price Index, annual appreciation data based on repeat sales and appraisals
+3.8%
YoY Change (2024)
235
HPI Index (2000 = 100)
+135%
Total Change Since 2000
Home values in ZIP 63366 have increased 3.8% over the past year (2024). Since 2000, this ZIP has seen +135% cumulative appreciation.
| Year | Annual Change | HPI Index |
|---|---|---|
| 2020 | +4.0% | 164 |
| 2021 | +9.3% | 179 |
| 2022 | +14.7% | 205 |
| 2023 | +10.5% | 227 |
| 2024 | +3.8% | 235 |
Source: Federal Housing Finance Agency (FHFA) House Price Index, All-Transactions, Five-Digit ZIP Codes (Developmental Index). Index base = 100 in year 2000. Data through 2024. ZIP codes with few transactions may show missing values.
What businesses operate in this ZIP?
Census Bureau data shows 1,192 business establishments in ZIP 63366, employing approximately 21,736 people with a combined annual payroll of $1,634,379,000.
1,192
Businesses
21,736
Employees
$1.6B
Annual Payroll
16
Industry Sectors
| Industry | Establishments | % of Total |
|---|---|---|
| Construction | 173 | 14.5% |
| Retail trade | 146 | 12.3% |
| Health care and social assistance | 130 | 10.9% |
| Accommodation and food services | 119 | 10.0% |
| Other services (except public administration) | 113 | 9.5% |
| Finance and insurance | 92 | 7.7% |
| Professional, scientific, and technical services | 82 | 6.9% |
| Administrative and support and waste management and remediation services | 76 | 6.4% |
| Real estate and rental and leasing | 66 | 5.5% |
| Wholesale trade | 62 | 5.2% |
| Manufacturing | 47 | 3.9% |
| Transportation and warehousing | 32 | 2.7% |
| Arts, entertainment, and recreation | 22 | 1.9% |
| Educational services | 14 | 1.2% |
| Information | 13 | 1.1% |
| Management of companies and enterprises | 4 | 0.3% |
Source: U.S. Census Bureau, ZIP Code Business Patterns (ZBP), 2023. Employment figures may include noise for disclosure avoidance.
Nearby ZIP Codes
Want a side-by-side? Compare 63366 vs 63368 →
More ZIP Codes in St. Charles County
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Frequently Asked Questions
What county is ZIP code 63366 in? ▼
What is the population of ZIP code 63366? ▼
What is the median household income in ZIP 63366? ▼
What is the average home value in ZIP 63366? ▼
What is the demographic makeup of ZIP 63366? ▼
How many businesses are in ZIP code 63366? ▼
What are the main industries in ZIP code 63366? ▼
How have home values changed in ZIP code 63366? ▼
What is the education level in ZIP code 63366? ▼
What is the average commute time in ZIP 63366? ▼
What percentage of residents own vs. rent in ZIP 63366? ▼
What is the poverty rate in ZIP code 63366? ▼
ZIP Code Research Guides
Official Data Resources for O Fallon, MO
Verify and explore additional data for this area using these official government sources.
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023). Business data: Source: Census ZIP Code Business Patterns (ZBP) 2023. Home value trends: Source: FHFA House Price Index (HPI), Five-Digit ZIP Codes.
PlainZIP is not affiliated with the U.S. Census Bureau or any government agency.
Read our methodology , how this data is sourced, computed, and verified.