PlainZIP

O Fallon, MO · standard

ZIP Code 63366

St. Charles County, Missouri - Census ACS demographics, housing tenure, and business patterns, benchmarked against every US ZIP.

46,175
259/sq mi
$100,621
Median income
$304,500
Median home value
33.3%
Bachelor's or higher

The verdict

O Fallon pairs an upper-quartile household income with above-median home values, in a low-density, homeowner-dominated area.

Top 19%
household income, US ZIPs
Top 33%
home value, US ZIPs
259
people per sq mi
82%
owner-occupied homes

Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 63366 against every reporting US ZIP.

ZIP code 63366 is a densely settled ZIP (a standard USPS delivery area) in O Fallon, St. Charles County, Missouri, with 46,175 residents across 178.1 square miles, a density of 259 people per square mile, in the Chicago time zone.

ZIP 63366 lands in the middle-income range, with a median household income of $100,621 (51% above the Missouri average), while per-capita income is $45,718. Local economic indicators show a 7.0% poverty rate alongside 3.5% unemployment. Housing costs here run $304,500 for a typical home value (59% above the state average), with rent averaging $1,302 a month; 82.1% of homes are owner-occupied.

A solid share of residents have a four-year degree: 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 on this page is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates (including median rent) and the FHFA House Price Index, no estimates, no proprietary scoring. Verify with Census →

Top industries in ZIP 63366

Top 5 sectors by establishment count in O Fallon, MO

Which industries have the most business establishments in ZIP 63366.

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 · ZIP Code Business Patterns (ZBP) As of 2023

Source: U.S. Census Bureau, American Community Survey 5-Year Estimates + ZIP Code Business Patterns + FHFA HPI ACS demographics and median rent, ZBP business establishments, 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; 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

Neighborhood Scorecard
Get an A-F grade across income, safety, housing, rent, education, commute, and childcare for this ZIP code.
View Scorecard →

Who lives in ZIP 63366?

40.4

Median Age

49.8%

Male

50.2%

Female

5.5%

Foreign-Born

White 81.5%
African American 5.5%
Asian 3.1%
American Indian or Alaska Native 0.0%
Native Hawaiian or Pacific Islander 0.0%
Two or More Ethnicities 8.9%
Hispanic or Latino 6.4%

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

How ZIP 63366 ranks nationally

O Fallon, MO household income vs. every US ZIP code

Median household income, the full national distribution, with this ZIP marked

$100,621 Top 19% higher than 81% of 30,318 US ZIPs

$0–$20,000: 118 US ZIPs (0%). Below this entry. $20,000–$40,000: 1,573 US ZIPs (5%). Below this entry. $40,000–$60,000: 7,092 US ZIPs (23%). Below this entry. $60,000–$80,000: 9,980 US ZIPs (33%). Below this entry. $80,000–$100,000: 5,778 US ZIPs (19%). Below this entry. $100,000–$120,000: 2,855 US ZIPs (9%). This entry sits in this band. $120,000–$140,000: 1,362 US ZIPs (4%). Above this entry. $140,000–$160,000: 686 US ZIPs (2%). Above this entry. $160,000–$180,000: 364 US ZIPs (1%). Above this entry. $180,000–$200,000: 186 US ZIPs (1%). Above this entry. $200,000–$220,000: 324 US ZIPs (1%). Above this entry. This ZIP $0 $200K+ every reporting US ZIP, bucketed by value

Each bar is a $20K-wide band; taller bars hold more US ZIPs. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source U.S. Census Bureau, ACS 5-Year Estimates · 2019–2023

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What is the education profile here?

High School Graduate or Higher 62.4%
Bachelor's Degree or Higher 33.3%

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

Owner 82.1%
Renter 17.9%

$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 →

ZIP 63366 vs its nearest neighbors, by population

Resident population of this ZIP and the closest reporting ZIP codes within ~10 miles.

residents

What this shows Among its immediate neighbors, ZIP 63366 ranks #2 by population - useful context the national average alone can't give.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2019–2023

ZIP 63366 vs its nearest neighbors, by median income

Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.

median income

What this shows By household income, ZIP 63366 ranks #5 of 8 neighboring ZIPs, local affluence varies block to block, not just metro to metro.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2019–2023
ZIP Code City Population Distance
63368 O Fallon, MO 43,360 7.5 mi
63369 Old Monroe, MO 2,258 6.0 mi
63367 Lake Saint Louis, MO 19,433 6.9 mi
63376 Saint Peters, MO 70,828 6.9 mi
62036 Golden Eagle, IL 704 8.1 mi
63385 Wentzville, MO 35,750 8.6 mi
63389 Winfield, MO 6,336 10.6 mi

More ZIP Codes in St. Charles County

63376 standard
Saint Peters, MO
Pop: 70,828
63301 standard
Saint Charles, MO
Pop: 48,514
63303 standard
Saint Charles, MO
Pop: 45,834
63368 standard
O Fallon, MO
Pop: 43,360
63304 standard
Saint Charles, MO
Pop: 40,336
63385 standard
Wentzville, MO
Pop: 35,750

Related Areas

St. Charles County O Fallon, MO Missouri

Frequently Asked Questions

What county is ZIP code 63366 in? ▼
ZIP code 63366 (O Fallon) is located in St. Charles County, Missouri. St. Charles County contains multiple ZIP codes, see the full list at /counties/st-charles-mo.
What is the population of ZIP code 63366? ▼
ZIP code 63366 in O Fallon, MO has a population of 46,175 according to the Census Bureau ACS 2023 estimates.
What is the median household income in ZIP 63366? ▼
The median household income in ZIP 63366 is $100,621, which is 32% above the national average of $76,288.
What is the average home value in ZIP 63366? ▼
The median home value in ZIP 63366 is $304,500, which is 9% above the national average of $278,155.
What is the demographic makeup of ZIP 63366? ▼
The largest racial group in ZIP 63366 is White at 81.5%. Hispanic or Latino residents make up 6.4% of the population.
How many businesses are in ZIP code 63366? ▼
ZIP code 63366 has 1,192 business establishments employing approximately 21,736 people, according to Census Bureau ZIP Code Business Patterns (ZBP) 2023 data.
What are the main industries in ZIP code 63366? ▼
The top industries by establishment count in ZIP 63366 are: Construction (173), Retail trade (146), Health care and social assistance (130). There are 16 industry sectors represented in total.
How have home values changed in ZIP code 63366? ▼
According to the FHFA House Price Index, home values in ZIP 63366 increased by 3.8% in 2024. Since 2000, home values in this ZIP have appreciated by approximately 135%. This is a developmental index based on repeat sales and appraisal data from Fannie Mae and Freddie Mac.
What is the education level in ZIP code 63366? ▼
In ZIP code 63366, 62.4% of residents aged 25+ have a high school diploma or higher, and 33.3% hold a bachelor's degree or higher. These figures come from the Census Bureau ACS 5-Year Estimates (2023).
What is the average commute time in ZIP 63366? ▼
The mean commute time for workers in ZIP code 63366 is 24.9 minutes according to Census ACS data. The national average is roughly 26 minutes, so commuters here spend less time traveling to work than typical.
What percentage of residents own vs. rent in ZIP 63366? ▼
In ZIP code 63366, approximately 82.1% of occupied housing units are owner-occupied and 17.9% are renter-occupied, based on Census ACS 2023 data.
What is the poverty rate in ZIP code 63366? ▼
The poverty rate in ZIP code 63366 is 7.0% according to Census Bureau ACS 2023 estimates. This measures the percentage of the population living below the federal poverty threshold.

Read our methodology to see how this data is sourced, computed, and verified.