Seneca is a village of 3,490 in LaSalle County, about 65 miles southwest of downtown Chicago · Updated November 2026
Is Seneca, IL safe?
Yes. Most US neighborhoods have little crime, and Seneca has less than most of them: its overall CrimeGrade™ is A+, safer than the neighborhoods where 90% of Americans live. Violent and property crime both grade A+ here. Every neighborhood in Seneca grades A+.
A+
Overall CrimeGrade™
Safety score 960 of 1,000Safer than most US neighborhoodsi What this means
90% of Americans live in neighborhoods with more crime than Seneca as a whole, and 10% in neighborhoods with less. The typical US neighborhood has a safety score of 838, a CrimeGrade™ of A-. Seneca scores 960.
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 Seneca, IL at ISP Reports.
Who this page is for: homeowners and renters in Seneca, 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
Crime rates and types in Seneca
CrimeGrade™ estimates Seneca has about 17 reported crimes a year for every 1,000 residents, 55% less than the US as a whole and 60% 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.
The largest share of crime reported in Seneca is assault, about 39% of the total. It also makes up the largest share of what crime costs here.
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.
How Seneca compares with nearby cities
Seneca has less crime than 2 of its 3 nearest cities; only Mazon has less.
Two things set Seneca apart: it has 5.0 parking-lot spaces per resident, against 2.0 nationally, and 2% of its residents in dense blocks, against 24% nationally. Places with a lot of parking-lot space tend to report more theft, yet theft runs lower here than that would suggest.
Parking lotsBig lots at stores, offices and apartment complexes. Places with more lot space tend to report more theft.5.0 spaces per residentUS: 2.0Higher than for 97% of US city residents
Residents in dense blocksBlocks of 10,000 or more people per square mile. Dense neighborhoods tend to report more robbery and car theft.2% of residentsUS: 24%Lower than for 87% 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. 88% of residents here live in car-dependent areas.D (12 of 100)US: 21Lower than for 68% of US city residents
Show all 6
Lit at nightSatellite images show which neighborhoods are lit at night, a sign of busy streets and businesses. Brightly lit places tend to report more theft and vandalism.57% where people liveUS: 78%Lower than for 84% of US city residents
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 Seneca: F (0 of 100).NoneUS: noneLower than for 84% of US city residents
JobsJobs draw daytime crowds. Places with many jobs tend to report more theft and robbery.25 for every 100 residentsUS: 45Lower than for 79% of US city residents
BestNeighborhood, a sister site of CrimeGrade™, ranks the neighborhoods of Seneca on shops, parks, home prices, getting around and more.
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 Seneca
Crime costs Seneca about $457 a year per household, counting police, courts and prisons as well as victims' losses, 62% 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 $1.6 million a year, or $470 per resident.
How the cost breaks down
Crime
Cost a year
Per resident
Murder
$45,000
$13
Rape
$93,000
$27
Robbery
$5,000
$1
Assault
$220,000
$63
Burglary
$52,000
$15
Theft
$89,000
$25
Vehicle theft
$21,000
$6
Arson
$6,000
$2
Vandalism
$68,000
$20
Total
$600,000
$171
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 Seneca 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 Seneca, IL average a SchoolGrade of B: 46% of students test proficient, against 28% projected for schools like them. Overall, they meet expectations. See schools in Seneca on SchoolGrade
