- Illinois Branch of The International Dyslexia Society
- Illinois Independent Living Center
- Immigrant Solidarity DuPage
- Indian Boundary YMCA
- Innovation DuPage
- Inside Out Club DuPage
- Interfaith Food Pantry
- Itasca Walk-In Ministry
- Junior Achievement of Chicago
- JUST of DuPage
- Kalapriya Foundation
- Keep DuPage Beautiful
- Kids Teen Rider
- KidsMatter
- Kiwanis Club of Wheaton
- Kline Creek Farm
