Also See: O Fallon, IL ZIP Codes & ZIP Code Maps
The City of O'Fallon had a population of 30,674 as of July 1, 2020. OFallon ranks in the upper quartile for Population Density and Diversity Index when compared to the other cities, towns and Census Designated Places (CDPs) in Illinois. See peer rankings below.
The primary coordinate point for OFallon is located at latitude 38.5923 and longitude -89.9112 in St. Clair County. The formal boundaries for the City of O'Fallon encompass a land area of 14.85 sq. miles and a water area of 0.12 sq. miles. St. Clair County is in the Central time zone (GMT -6). The elevation is 548 feet.
The City of O'Fallon (GNIS ID: 2395302) has a C1 Census Class Code which indicates an active incorporated place that does not serve as a county subdivision equivalent. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.
|Total Population||30,674 (100%)|
|Population in Households||30,638 (99.9%)|
|Population in Families||25,910 (84.5%)|
|Population in Group Quarters1||36 ( 0.1%)|
|Median Household Income||$81,938|
|Average Household Income||$103,292|
|% of Income for Mortgage4||11%|
|Per Capita Income||$40,357|
|Total HU (Housing Units)||12,434 (100%)|
|Owner Occupied HU||7,878 (63.4%)|
|Renter Occupied HU||3,852 (31.0%)|
|Vacant Housing Units||704 ( 5.7%)|
|Median Home Value||$211,400|
|Average Home Value||$245,766|
|Housing Affordability Index3||190|
|Average Household Size||2.61|
|Average Family Size||3|
GROWTH RATE / YEAR
|Median Household Income||1.07%|
|Per Capita Income||1.98%|
|Owner Occupied HU||0.1%|
The table below compares OFallon to the other 1,369 incorporated cities, towns and CDPs in Illinois by rank and percentile using July 1, 2020 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.
|Total Population||# 65||95th|
|Population Density||# 267||81st|
|Median Household Income||# 202||85th|
|Housing Affordability Index||# 411||30th|
|Per Capita Income||# 182||87th|
|Diversity Index||# 212||85th|
Additional comparisons and rankings can be made with a VERY EASY TO USE Illinois Census Data Comparison Tool.