The Safest and Most Dangerous Places in O'Fallon, IL
O'Fallon is a city of 31,100 in St. Clair County, about 15 miles east of downtown St. Louis · Updated November 2026
Is O'Fallon, IL safe?
Yes. Crime is low across most of the US, and lower still in O'Fallon: an overall CrimeGrade™ of A, safer than the neighborhoods where 63% of Americans live. Violent and property crime both grade A here. Its neighborhoods are much alike, from A+ to A-; see the map below.
A
Overall CrimeGrade™
Safety score 890 of 1,000Safer than most US neighborhoodsi What this means
63% of Americans live in neighborhoods with more crime than O'Fallon as a whole, and 37% in neighborhoods with less. The typical US neighborhood has a safety score of 838, a CrimeGrade™ of A-. O'Fallon scores 890.
Crime is concentrated in a small share of places, so most neighborhoods score high on the 0 to 1,000 scale. That is why a score in the 800s can still mean more crime than most US neighborhoods.
How to read the map: each area's color compares its crime with the people, homes and cars there, on one national scale, from green for the least crime to red for the most. Each area gets its own color, so a busy shopping center can show red while the homes beside it stay green. The interactive maps load faster on a strong connection. Compare high speed internet in O'Fallon, IL at ISP Reports.
Who this page is for: homeowners and renters in O'Fallon, and anyone thinking about buying or renting a home there.
Business and enterprise customers: this free map shows neighborhood areas. CrimeGrade™ business reports map crime at about 66-meter detail and estimate it for one address and type of business. See business reports
What stands out in O'Fallon
Thefts and aggravated assaults both run low. In O'Fallon, each runs at about half the US rate: 6.5 thefts and 1.4 aggravated assaults a year per 1,000 residents, against 13.1 and 2.6 nationally.
The safest and least safe parts of O'Fallon
Every part of O'Fallon where people live grades A or B on the national scale. Grades across O'Fallon run from A+ to A-; 94% of residents live in areas with less crime than the typical US neighborhood.
100%
A or B 100%
Share of residents, by the overall CrimeGrade™ of the area they live in.
Within O'Fallon, the northwest side has the least crime and the south side the most.
Is crime going up in O'Fallon?
Reported violent crime in O'Fallon peaked in 2020 and has fallen 13% since, back near its 2019 level. Property crime is down 29% from 2019. Murders, rapes, robberies and aggravated assaults went from about 1.8 to 1.9 a year per 1,000 residents (US: 3.7); burglaries, thefts and vehicle thefts from about 14 to 10 (US: 18). In 2024 alone, violent crime rose 29% and property crime fell 21%.
Violent crime, change since 2019
Property crime, change since 2019
O'FallonUnited States
Source: crime reports to the FBI from the police department that serves O'Fallon. The charts follow crimes per resident.
Data table
Year
Violent, O'Fallon
Violent, US
Property, O'Fallon
Property, US
2016
-14%
+4%
+24%
+15%
2017
+3%
+4%
+44%
+12%
2018
+53%
+0%
+28%
+4%
2019
+0%
+0%
+0%
+0%
2020
+24%
+4%
-19%
-8%
2021
-24%
+6%
-31%
-10%
2022
-13%
+5%
-21%
-6%
2023
-17%
+2%
-11%
-7%
2024
+8%
-4%
-29%
-15%
Crime rates and types in O'Fallon
CrimeGrade™ estimates O'Fallon has about 19 reported crimes a year for every 1,000 residents, 48% less than the US as a whole and 54% less than Illinois.
Overall crime
Violent crime
Property crime
Reported crimes a year, per 1,000 residents. These figures include simple assaults and vandalism, which the FBI's violent and property crime rates leave out.
Theft makes up about 34% of crime reported in O'Fallon. Assault is less common but costs more, because each one does more harm.
Each CrimeGrade™ compares a crime with what it affects: people for assaults and robbery, homes for burglary, parked cars for vehicle theft. Rates count crimes per 1,000 residents.
Select a crime's name to see its map above. CrimeGrade™ business reports map each crime at about 66-meter detail.
Where and when crime happens in O'Fallon
O'Fallon has its own police department, and these figures come from its reports, 2022 to 2024.
In O'Fallon, 43% of burglaries hit homes, against 57% nationally. Thefts from cars happen most often at homes: 36% of them, against 34% nationally.
Crime
Most often at
Busiest time
Burglary
Homes (43%)
Morning (6 am to noon)
Car theft
Homes (48%)
Afternoon (noon to 6 pm)
Theft from cars
Homes (36%)
Morning (6 am to noon)
Vandalism
Homes (43%)
Evening (6 pm to midnight)
Aggravated assault
Homes (61%)
Afternoon (noon to 6 pm)
Shares of the crimes reported to police, 2022 to 2024. Reports with no time recorded are left out of the times.
How O'Fallon compares with nearby cities
Of the 9 cities closest to O'Fallon, 6 have less crime. Scott Air Force Base and Scott AFB have the least.
One thing sets O'Fallon apart: it has 4% of its residents in dense blocks, against 24% nationally. Places like that tend to report less robbery and car theft; here car theft sits near the national middle.
Residents in dense blocksBlocks of 10,000 or more people per square mile. Dense neighborhoods tend to report more robbery and car theft.4% of residentsUS: 24%Lower than for 78% of US city residents
Parking lotsBig lots at stores, offices and apartment complexes. Places with more lot space tend to report more theft.2.3 spaces per residentUS: 2.0Higher than for 70% of US city residents
Walk GradeBestNeighborhood's grade for getting through daily life on foot, traced along real walking routes to shops, schools and parks. Walkable places tend to report more theft and assault. 86% of residents here live in car-dependent areas.D (13 of 100)US: 21Lower than for 64% of US city residents
Show all 6
Transit serviceBuses and trains an hour at the evening rush. Places with busy transit tend to report more theft and robbery. BestNeighborhood's Transit Grade for O'Fallon: D- (10 of 100).4 trips an hourUS: noneHigher than for 65% of US city residents
Empty homesSeasonal and vacation homes are left out. Places with many empty homes tend to report more burglary, vandalism and arson.4.9% of homesUS: 7.1%Lower than for 60% of US city residents
JobsJobs draw daytime crowds. Places with many jobs tend to report more theft and robbery.37 for every 100 residentsUS: 45Lower than for 59% of US city residents
These traits tend to go with more or less crime; none of them causes it on its own. Sources: Census job counts and housing figures, OpenStreetMap and Overture business listings, CrimeGrade™ parking estimates, NASA night-light imagery, US Forest Service tree cover, EPA transit data and BestNeighborhood's Walk Grade.
What crime costs O'Fallon
Counting police, courts and prisons as well as victims' losses, crime costs O'Fallon about $539 a year per household, 55% less than the US figure of $1,205.
Cost of crime per resident, per year
Counting the pain and suffering of victims, which comes almost entirely from violent crime, the full cost comes to about $19 million a year, or $598 per resident.
How the cost breaks down
Crime
Cost a year
Per resident
Murder
$660,000
$21
Rape
$530,000
$17
Robbery
$100,000
$3
Assault
$2.3 million
$73
Burglary
$460,000
$15
Theft
$1.0 million
$34
Vehicle theft
$710,000
$23
Arson
$39,000
$1
Vandalism
$730,000
$23
Total
$6.5 million
$210
How CrimeGrade™ works
A CrimeGrade™ shows how much crime an area has compared with the rest of the country, from A+ for the least crime to F for the most. Every neighborhood in the US is graded on the same scale, so a B in O'Fallon means the same as a B anywhere else.
CrimeGrade™ starts from the crimes people report to police and measures each kind of crime against what it affects: people for assaults, homes for burglaries, parked cars for car thefts.
The rates on this page count crimes for every 1,000 people who live here, the way police departments report them.
Comparisons with US neighborhoods use the Census Bureau's block groups, small areas of about 1,400 residents, and count the people who live in each. The figures count crimes reported to police; many crimes, shoplifting above all, never are. Behind the grades, CrimeGrade™ tested 21,607 factors from 125 data families. For business owners, paid CrimeGrade™ location reports estimate crime at a single address for each type of business.
Where the numbers come from
Crime reports that police departments file with the FBI
State crime records and city crime data, where they are published
Published research on what crime costs victims and communities
These are estimates of reported crime for whole areas, not a record of what happened on any one street. CrimeGrade™ updates them once a year and provides them free and without guarantee. Check local sources before you rely on them for a decision.
Schools in O'Fallon, IL average a SchoolGrade of B+: 50% of students test proficient, against 31% projected for schools like them. Overall, they exceed expectations. See schools in O'Fallon on SchoolGrade
