- Counties are included if at least two school districts participated at any grade level.
- In
most cases, the usage rates do not represent every school in the
county, but just the students at the participating schools, and only
those students who filled out a survey. Pay particular attention to the
introduction to determine how representative the report is.
- To see a listing of schools that participated in 2008-2018, visit our school participation page.
2018 County Reports
All
publicly available county reports are listed below and contain the full
array of questions asked on the IYS. For a snapshot of substance use
for all Illinois counties, see our 2018 IYS County Snapshot.
For prior year reports, visit our
archives.