OFallon, IL Profile: Facts, Map & Data

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OFallon, Illinois - Basic Facts

The City of O'Fallon had a population of 30,358 as of July 1, 2017. 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 38.6 and longitude -89.9155 in St. Clair County. The formal boundaries for the City of O'Fallon (see map below) 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.

The City of O'Fallon is located within Township of O'Fallon, a minor civil division (MCD) of St. Clair County.

Beneath the boundary map are tables with OFallon population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2017.


Neighborhood Data

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City of O'Fallon, IL Boundary Map



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Boundary Maps: Township of O'Fallon | St. Clair County | Illinois Counties

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OFallon, IL Data & Demographics (As of July 1, 2017)

POPULATION

Total Population 30,358
Daytime Population: Workers 11,256
Daytime Population: Residents 14,857
Total Daytime Population (TDP) 26,113
Ratio TDP/Total Population1 0.86
Population in Households 30,320
Population in Familes 25,750
Population in Group Qrtrs 38
Population Density2 2,044
Diversity Index3 45
 

INCOME

Median Household Income $79,794
Average Household Income $100,500
Per Capita Income $38,667

HOUSING

Total Housing Units 12,017 (100%)
Owner Occupied HU 7,627 (63.5%)
Renter Occupied HU 3,792 (31.6%)
Vacant Housing Units 598 ( 5.0%)
Median Home Value $194,946
Average Home Value $229,424
 

HOUSEHOLDS

Total Households 11,419
Average Household Size 2.66
Family Households 8,085
Average Family Size 3
NOTES
  1. If the ratio of the TDP to Total Population is greater than 1, the location gains population during the day when commuting workers are present. If the ratio is less than 1, the location is more of a bedroom community where people commute to another place for work.
  2. Population Density = Total Population per square mile.
  3. The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.

GROWTH RATE / YEAR

2010-2017 2017-2022
Population 0.84% 0.16%
Households 0.71% 0.12%
Families 0.33% 0.01%
Median Household Income   2.14%
Per Capita Income   2.33%

OFallon, IL - Peer Comparisons by Rank and Percentile

The table below compares OFallon to the other 1,368 incorporated cities, towns and CDPs in Illinois by rank and percentile using July 1, 2017 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.

Variable Description Rank Percentile
Total Population # 66 95th
Population Density # 265 81st
Diversity Index # 217 84th
Median Household Income # 169 88th
Per Capita Income # 149 89th

Additional comparisons and rankings can be made with a VERY EASY TO USE Illinois Census Data Comparison Tool.

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