City profile · Illinois · Census ACS 2023

O'Fallon, IL

Population, income, housing, safety, climate and schools for O'Fallon - drawn straight from Census ACS, FBI UCR, NOAA, NCES, HUD and FEMA, refreshed on the 2024–2025 release cycle.

32,139
Residents
$102,793
Median income
$274,100
Median home
$1,218
Median rent (state)

O'Fallon - the verdict

Measured against every US city with at least 1,000 residents, O'Fallon lands in the 79th percentile for household income and the 55th percentile for safety. Source: Census ACS + FBI UCR.

79th
percentile, household income
60th
percentile, home value
38th
percentile, median rent
55th
percentile, safety
📝 How we sourced this

Population, income, and housing-cost figures come from the U.S. Census Bureau American Community Survey 5-year estimates (B-series tables). Crime data uses FBI UCR; climate uses NOAA Climate Normals; school counts come from NCES Common Core of Data; permits use the Census Building Permits Survey (BPS). See our methodology page for the full ETL pipeline and OMB / FIPS join keys.

Data Snapshot: O'Fallon, IL

Census ACS 2023 estimates count 32,139 residents in O'Fallon, a small city within Illinois. Median household income here is $102,793 per year, placing it in the top quartile of U.S. cities for household income, with a poverty rate of 3.1%. Home values in O'Fallon run a median of $274,100, and the median resident age is 36.9 years. Educational attainment runs 51.3% of adults with a bachelor's degree or higher. Separately, 62.0% of working-age residents are in the labor force.

The Census Building Permit Survey recorded 336 residential units authorized here in 2024 (Building Boom), up 167% from five years earlier. O'Fallon reports a comparatively low crime rate: per-100,000 total crime stands at 1214.8 in FBI UCR data, below the national average (a voluntary reporting program, read this as reporting activity, not a definitive danger score).

Illinois tracks close to the national cost-of-living baseline: the state registers 100.0 on a 100-equals-national-average index (Near Average) per BEA Regional Price Parities 2024. A typical two-bedroom carries a HUD Fair Market Rent of $1,218 per month statewide. Monthly utility costs average around $240 across Illinois, per EIA 2023 residential energy estimates. Natural-hazard exposure scores 94.9 out of 100 on FEMA's National Risk Index (Very High).

Population

32,139 residents

Census ACS 2023 - Illinois

Median Household Income

$102,793 /yr

Poverty 3.1%

Cost of Living Index (state)

100.0 (US=100)

Near Average - BEA RPP 2024, Illinois average

How does O'Fallon compare to other US cities?

O'Fallon measured against every US city with 1,000+ residents, computed live from the same Census and FBI data shown throughout this page.

Household income 79% higher than other cities
Home value 60% pricier than other cities
Median rent 38% pricier than other cities
Safety 55% safer than other cities

"Safer than" reflects total crime rate from FBI UCR; the others use Census ACS estimates.

A national percentile can hide a lot of local variation: narrowed to Illinois alone, O'Fallon ranks #277 of 455 Illinois cities by lowest crime rate - a different, more locally useful comparison than stacking it against the entire country.

How we calculate these percentiles & ranks

For each metric we count every US city with population 1,000+ and a non-null value, then compute what share of them fall below O'Fallon's value: round(cities-below ÷ total × 100). Safety is inverted (percentile = share of cities with a higher crime rate) so a higher number always means safer. The in-state rank narrows that same crime-rate comparison to only the cities PlainCities tracks in Illinois, breaking ties alphabetically. See the methodology page for the full source-to-figure lineage.

79thIncome percentile
55thSafety percentile

79th percentile nationally for median household income · 55th percentile for safety (lower crime rate). Source: Census ACS 2023 / FBI UCR 2023.

O'Fallon's profile vs. every US city

Income, affordability, and safety percentile

O'Fallon's percentile rank on 3 favorable-direction measures (income, affordability, safety) vs. every tracked US city -- higher on every axis is more favorable. Not a composite quality score, just the arithmetic mean of the axes shown. 3-axis radar comparing 1 series across Income, Affordability, Safety. IncomeAffordabilitySafety 62 Avg. percentile National median
O'Fallon's percentile rank on 3 favorable-direction measures (income, affordability, safety) vs. every tracked US city -- higher on every axis is more favorable. Not a composite quality score, just the arithmetic mean of the axes shown.

How O'Fallon's home value compares nationally

Median home value vs. every US city (population 1,000+)

$274,100 40th percentile more affordable than 40% of 15,600 US cities

$0–$25,000: 5 US cities (0%). Below this entry. $25,000–$50,000: 54 US cities (0%). Below this entry. $50,000–$75,000: 352 US cities (2%). Below this entry. $75,000–$100,000: 1,086 US cities (7%). Below this entry. $100,000–$125,000: 1,516 US cities (10%). Below this entry. $125,000–$150,000: 1,170 US cities (8%). Below this entry. $150,000–$175,000: 1,278 US cities (8%). Below this entry. $175,000–$200,000: 1,229 US cities (8%). Below this entry. $200,000–$225,000: 1,035 US cities (7%). Below this entry. $225,000–$250,000: 976 US cities (6%). Below this entry. $250,000–$275,000: 754 US cities (5%). This entry sits in this band. $275,000–$300,000: 712 US cities (5%). Above this entry. $300,000–$325,000: 521 US cities (3%). Above this entry. $325,000–$350,000: 526 US cities (3%). Above this entry. $350,000–$375,000: 465 US cities (3%). Above this entry. $375,000–$400,000: 393 US cities (3%). Above this entry. $400,000–$425,000: 317 US cities (2%). Above this entry. $425,000–$450,000: 300 US cities (2%). Above this entry. $450,000–$475,000: 307 US cities (2%). Above this entry. $475,000–$500,000: 250 US cities (2%). Above this entry. $500,000–$525,000: 160 US cities (1%). Above this entry. $525,000–$550,000: 156 US cities (1%). Above this entry. $550,000–$575,000: 172 US cities (1%). Above this entry. $575,000–$600,000: 172 US cities (1%). Above this entry. $600,000–$625,000: 163 US cities (1%). Above this entry. $625,000–$650,000: 167 US cities (1%). Above this entry. $650,000–$675,000: 135 US cities (1%). Above this entry. $675,000–$700,000: 101 US cities (1%). Above this entry. $700,000–$725,000: 95 US cities (1%). Above this entry. $725,000–$750,000: 71 US cities (0%). Above this entry. $750,000–$775,000: 65 US cities (0%). Above this entry. $775,000–$800,000: 70 US cities (0%). Above this entry. $800,000–$825,000: 57 US cities (0%). Above this entry. $825,000–$850,000: 67 US cities (0%). Above this entry. $850,000–$875,000: 60 US cities (0%). Above this entry. $875,000–$900,000: 58 US cities (0%). Above this entry. $900,000–$925,000: 47 US cities (0%). Above this entry. $925,000–$950,000: 37 US cities (0%). Above this entry. $950,000–$975,000: 31 US cities (0%). Above this entry. $975,000–$1,000,000: 470 US cities (3%). Above this entry. $1,000,000–$1,025,000: 0 US cities (0%). Above this entry. O'Fallon $0 $1,025,000 every US city, bucketed by value

Each bar is a $25K-wide band; taller bars hold more US cities. 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 · 2023

Income distribution context

Household income distribution - O'Fallon, IL O'Fallon, IL's reported median household income shown against the U.S. national quintile-share pattern (not O'Fallon, IL-specific quintile data). The Lorenz curve traces the national cumulative income share against cumulative population share, perfect equality is the diagonal; observed inequality bows below. $ Household Income Distribution O'Fallon, IL median $102,793/yr, vs. U.S. national quintile pattern QUINTILE SHARE OF AGGREGATE INCOME Lowest 20% 3.4% Second 20% 9.2% Middle 20% 15.1% Fourth 20% 23.2% Top 20% 49.1% LORENZ CURVE cumulative income vs. population 100% 0% 100% pop. 0%
O'Fallon, IL's median household income (Census ACS 5-year estimate) plotted against the U.S. national income-quintile distribution pattern for context; the quintile shares and Lorenz curve are national figures, not computed specifically for O'Fallon, IL. Diagonal = perfect equality.

Key socioeconomic indicators

Bachelor's degree or higher (adults 25+) 51.3%

Census ACS S1501, educational attainment

Poverty rate (households below FPL) 3.1%

Census ACS S1701, poverty status

Labor force participation (adults 16+) 62.0%

Census ACS S2301, share of working-age residents in the labor force

Population
32,139
Median Income
$102,793
Median Home Value
$274,100
Median Age
36.9
Poverty Rate
3.1%
Labor force participation
62.0%
Bachelor's Degree+
51.3%

Safety & Crime

Total Crime Rate
1214.8
per 100,000 residents
Violent Crime
194.6
per 100,000 residents
Property Crime
1020.2
per 100,000 residents

Reflects incidents reported to the FBI's Uniform Crime Reporting program — agency participation is voluntary and reporting completeness varies by jurisdiction and year, so this reflects reporting activity, not a definitive danger score. Not adjusted for tourism, commuter, or daytime population.

Population Change

Annual U.S. Census Bureau Population Estimates Program (PEP) estimates, 2020–2025

See the fastest-growing cities →
32,000 residents32,200 residents32,400 residents32,600 residents32,800 residents 202020212022202320242025 32,410 residents 32,656 residents ▲ +0.8%
O'Fallon's Census PEP population estimates, 2020–2025.

Housing Supply

Census Bureau Building Permits Survey (BPS) - annual residential permits authorized

📈 Building Boom
Total Permits (2024)
336
housing units authorized
Single-Family
100
detached homes
Multifamily
236
apartments & condos
Supply Intensity
10.5
permits per 1,000 residents

5-Year Permit Trend (2019–2024)

Year Total
2019 126
2020 154
2021 128
2022 121
2023 105
2024 336

Permit volume increased 167% from 2019 to 2024.

Commute Patterns

How workers travel to work, Census ACS 2023

Drive Alone
75.2%
Carpool
5.4%
Public Transit
0.4%
Walk
1.1%
Work from Home
16.7%
Other
1.2%

Based on 15,123 workers 16 and over.

Monthly Utility Costs

State-average estimates for Illinois - EIA 2023 residential energy data

Electricity
$100
avg/month
Natural Gas
$90
avg/month
Water & Sewer
$50
avg/month
Total Utilities
$240
estimated/month

Estimates reflect Illinois state averages. Actual costs vary by home size, usage, and local rates. Source: U.S. Energy Information Administration (EIA) 2023.

Living Costs & Risk

Cost of living is a Illinois state average from BEA; rent and hazard risk are county-level figures from HUD and FEMA for the county O'Fallon sits in

Cost of Living Index
100.0
Near Average
US average = 100 · BEA RPP 2024
Typical 2-BR Rent
$1,218/mo
HUD Fair Market Rent
County-level FMR estimate
Natural Hazard Risk
94.9 / 100
Very High
FEMA NRI composite score (county)

Similar Cities in Illinois

Elk Grove Village
32,132 people
Pekin
31,812 people
Mundelein
31,632 people
St. Charles
32,733 people
Glendale Heights
32,864 people
North Chicago
30,772 people

Cities of a Similar Size Nationwide

Population-matched peers from other states, closest to O'Fallon's 32,139 residents (Census ACS 5-Year 2023).

Wheat Ridge, CO
32,158 people
Nacogdoches, TX
32,104 people
Massillon, OH
32,177 people
Long Branch, NJ
32,184 people
Hutto, TX
32,188 people
Oak Ridge, TN
32,088 people

Cities with a Similar Household Income Nationwide

Median-household-income-matched peers from other states, closest to O'Fallon's $102,793 (Census ACS 5-Year 2023, table B19013).

Kechi, KS
$102,794 median income
Beachwood, OH
$102,798 median income
North Lakes, AK
$102,785 median income
Sandia Knolls, NM
$102,801 median income
Marlboro, NJ
$102,813 median income
Summer Set, MO
$102,760 median income

Race & Ethnicity Composition

Race and ethnicity - O'Fallon, IL Race categories sum to one hundred percent per Census methodology. Hispanic or Latino is shown separately as an ethnicity overlay; it cuts across all race categories per OMB Directive 15. Race & Ethnicity Composition O'Fallon, IL - Census ACS, OMB race + ethnicity categories RACE, sums to 100% 72.6% 13.6% 9.3% ETHNICITY, Hispanic or Latino (any race) 6.0% White 72.6% Black or African American 13.6% Asian 2.9% American Indian 0.1% Native Hawaiian 0.0% Some other race 1.5% Two or more races 9.3% Per OMB Directive 15: Hispanic/Latino ethnicity is reported separately from the race categories.
Race categories sum to 100%. Hispanic or Latino ethnicity is reported separately and cuts across race per Census/OMB methodology.

City-level race and ethnicity, Census ACS 5-year 2023 (tables B02001, B03001), OMB Directive 15 categories.

How O'Fallon compares to nearby Illinois cities

Population + median household income, sourced from Census Bureau ACS 5-year B01001 (population) and B19013 (median household income).

City Population Median Household Income
O'Fallon (this city) 32,139 $102,793
Elk Grove Village 32,132 $95,216
Pekin 31,812 $58,355
Mundelein 31,632 $107,608
Census ACS 5-year FIPS IL FBI UCR Census BPS 2024 OMB Bulletin 23-01

What do people ask about O'Fallon, IL?

What is the population of O'Fallon, IL? +

O'Fallon, IL has a population of 32,139 according to U.S. Census Bureau ACS 2023 estimates.

What is the median household income in O'Fallon, IL? +

Median annual household income in O'Fallon runs $102,793, based on Census ACS 2023 data.

What is the cost of living in O'Fallon? +

BEA does not publish a city-level cost-of-living figure for O'Fallon; the closest available measure is the Illinois state average, a cost of living index of 100.0 (U.S. average = 100), rated "Near Average" based on BEA Regional Price Parities 2024 data. Costs within Illinois vary by metro area.

Is O'Fallon, IL safe? +

O'Fallon has a total crime rate of 1214.8 per 100,000 residents, which is below the national average. This reflects incidents reported to the FBI UCR program, not a definitive safety score -- agency reporting is voluntary and completeness varies by jurisdiction.

What is the median home value in O'Fallon, IL? +

O'Fallon's median home value sits at $274,100, according to Census ACS 2023 estimates.

Source: U.S. Census Bureau ACS 5-Year 2023, FBI UCR, Census BPS 2024, Census ACS B08301/B08136, U.S. Energy Information Administration (EIA) 2023, BEA Regional Price Parities 2024, HUD Fair Market Rents 2026, FEMA National Risk Index.

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

Primary sources: Census ACS, FBI UCR, NOAA Climate Normals, NCES.

Citation & verification links Data sourced from the U.S. Census Bureau. See our methodology for details. Retrieved and formatted by PlainCities Editorial

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Every figure on PlainCities is rendered directly from Census ACS source data, no number is typed in by an editor. This page draws directly on Census ACS source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.