Zip Code 63366
O Fallon, Missouri — St. Charles County
📍 ZIP code 63366 is in O Fallon, St. Charles County, Missouri.
ZIP code 63366 is located in O Fallon, St. Charles County, Missouri. It is a zip code in the Central (CST/CDT) Time Zone with an estimated population of 54,449. The area code for ZIP code 63366 is 636.
Quick Answer
Zip code 63366 is in O Fallon, Missouri (St. Charles County). It has a population of 54,449, median household income of $98,237, and median home value of $283,900.
Population
54,449
Income
$98,237
Home Value
$283,900
Climate
88°F / 21°F
About Zip Code 63366
Zip code 63366 is located in O Fallon, Missouri, within St. Charles County. Home to approximately 54,449 residents, this area sits at an elevation of 482 ft and falls within the Central (CST/CDT) timezone. The local area code is 636.
The median household income is $98,237 per year, which is above the national median of $70,784. Homes in this zip code have a median value of $283,900, and the cost of living index is 105 (5% above the national average of 100).
Summers average a high of 88°F while winters drop to 21°F. The area receives about 42 in of rain and 15 in of snow annually. The zip code covers 68.7 square miles of land area and 1.3 square miles of water.
Key Statistics
54,449
$98,237
$283,900
Central (CST/CDT)
636
482 ft
68.7 sq mi
39.2
21,204
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Compare With Nearby Zip Codes
| Metric | 63366 | 63369 | 63367 | 63376 | 63385 | 62036 |
|---|---|---|---|---|---|---|
| City | O Fallon, MO | Old Monroe, MO | O Fallon, MO | Saint Peters, MO | Wentzville, MO | Brussels, IL |
| Population | 54,449 | 2,984 | 27,893 | 74,876 | 50,420 | 531 |
| Median Income | $98,237 | $94,079 | $134,932 | $94,921 | $111,851 | $103,750 |
| Home Value | $283,900 | $320,200 | $381,000 | $255,500 | $321,300 | $221,900 |
| Cost of Living | 105 | 104 | 148 | 101 | 124 | 103 |
| Median Age | 39.2 | 35.4 | 39.7 | 41 | 37.1 | 55.8 |
Cost of Living
100 = National Average. O Fallon's cost of living is 5% above the national average.
vs. State Avg
Above
Affordability
Moderate
Income-to-Home
2.9x
Demographics
Zip code 63366 has a population of 54,449 people with a median age of 39.2. There are 21,204 housing units in this area.
Racial & Ethnic Composition
Source: U.S. Census Bureau American Community Survey estimates.
Population History
O Fallon (63366) population trend from 2010 to 2024
↓ -16.9%Source: U.S. Census Bureau estimates and American Community Survey data.
Climate & Weather
88°F
21°F
42 in
15 in
O Fallon experiences warm summers with average highs around 88°F. Winters are cool with lows averaging 21°F. The area receives about 15 in of snow per year.
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Housing & Economy
Median Home Value
$283,900
Median Household Income
$98,237
With 21,204 housing units across 68.7 square miles, 63366 has a housing density of 309 units per square mile. The home price-to-income ratio is 2.9x.
Location & Geography
Latitude
38.8575°
Longitude
-90.7253°
Land Area
68.7 sq mi
Water Area
1.3 sq mi
Nearby Zip Codes
Zip codes closest to 63366 (O Fallon, MO) with distances:
All Zip Codes in O Fallon, MO
Other zip codes serving O Fallon:
ZIP Codes with Similar Income Nationwide
The five U.S. ZIP codes whose median household income is closest to 63366's $98,237. A way to compare O Fallon to economically similar communities elsewhere in the country.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
ZIP Codes with Similar Demographics
The five U.S. ZIP codes whose racial and ethnic composition most closely matches 63366 (O Fallon, MO). Similarity is measured by cosine distance on the five-category ACS demographic vector.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
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People Also Ask
What zip code is O Fallon, Missouri?
O Fallon, Missouri uses zip code 63366 along with 1 other zip codes.
What county is zip code 63366 in?
Zip code 63366 is located in St. Charles County, Missouri.
What is the population of zip code 63366?
The population of zip code 63366 is 54,449 with a median age of 39.2.
Is 63366 in O Fallon, Missouri?
Yes, zip code 63366 is in O Fallon, St. Charles County, Missouri. The area code is 636.
Frequently Asked Questions
What city is zip code 63366 in?
Zip code 63366 is in O Fallon, Missouri. It is part of St. Charles County and uses the Central (CST/CDT) timezone.
What is zip code 63366?
Zip code 63366 is a U.S. postal code in O Fallon, Missouri (St. Charles County). It has a population of 54,449 and covers 68.7 square miles.
What is the population of zip code 63366?
The population of zip code 63366 (O Fallon, MO) is 54,449 with a median age of 39.2. There are approximately 21,204 housing units in this area.
What is the median income in zip code 63366?
The median household income in zip code 63366 (O Fallon, MO) is $98,237 per year. The cost of living index is 105 (100 = national average).
What is the average home price in zip code 63366?
The median home value in zip code 63366 (O Fallon, MO) is $283,900. The cost of living index is 105 compared to the national average of 100.
What county is zip code 63366 in?
Zip code 63366 is located in St. Charles County, Missouri. The primary city is O Fallon.
What is the area code for zip code 63366?
Zip code 63366 in O Fallon, MO uses area code 636. It is located in the Central (CST/CDT) timezone.
Is zip code 63366 a good place to live?
Zip code 63366 (O Fallon, MO) has a cost of living index of 105 (100 = national average), a median household income of $98,237, and median home values of $283,900. The median age is 39.2. Visit the full page for demographics, climate, and nearby zip code comparisons.
What is the cost of living in zip code 63366?
The cost of living index for zip code 63366 (O Fallon, MO) is 105, where 100 represents the national average. This area is above the national average. Median home value: $283,900.
What schools serve zip code 63366?
Zip code 63366 in O Fallon, Missouri is served by the local school district of St. Charles County. For specific school information, check your state's department of education or GreatSchools.org.
All demographic data on this page is sourced from the U.S. Census Bureau American Community Survey (ACS) 5-Year Estimates. ZIP code boundary and delivery data is sourced from the United States Postal Service (USPS). Data is updated periodically and may not reflect the most current figures. Census Bureau ZIP Code Tabulation Areas (ZCTAs) may differ slightly from USPS ZIP code boundaries.
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Data Sources
- Population, income, housing, age, and demographics
- U.S. Census Bureau, American Community Survey 5-Year Estimates, 2019-2023 vintage.
- ZIP to city and county mapping
- USPS and HUD-USPS ZIP-County Crosswalk.
- Time zones and area codes
- IANA tz database and NANPA.
- Elevation
- U.S. Geological Survey National Elevation Dataset (NED), via the USGS Elevation Point Query Service. Mapped to each ZCTA centroid coordinates. Last refreshed 2026-05-19.
- Last refreshed
- 2026-05-18.