- Irons Oaks
- 20000 Western Ave, Olympia Fields, IL
- Iroquois Community School
- 1836 E Touhy Ave, Des Plaines, IL
- Irwin Park
- 18120 Highland Avenue, Homewood, IL
- Island Prairie Park
- 7540 W. Braemar Lane, Frankfort
- Isle a la Cache Museum
- 501 E. Romeo Road, Romeoville, IL, 60446
- Isle a la Cache Museum
- Romeoville, Romeoville
- Itasca Historical Depot Museum
- 101 N. Catalpa, Itasca, IL, 60143
- Itasca Park District Waterpark
- 350 E. Irving Park Rd., Itasca
- Jackson Creek Park
- Laraway Rd. & Wolf Rd., Frankfort, IL, 60423
- Jap Pritzker Pavilion in Millennium Park
- 201 E. Randolph Street, Chicago, IL, 60601
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