According to County Health Rankings and Roadmaps, DuPage County is the healthiest in Illinois! They use factors like, tobacco use, employment, and percentage of the population that is uninsured. They also calculate things like length of life, and quality of life. Four metro counties made it into the top ten. DuPage #1, Lake #5, Kendall #6, McHenry #8. There are 102 counties in the state.

https://www.countyhealthrankings.org/app/illinois/2022/overview