Place
- Indian Head Park, Illinois1
- Ingalls Park, Illinois1
- Inverness, Illinois1
- Island Lake, Illinois1
- Itasca, Illinois1
- Johnsburg, Illinois1
- Joliet, Illinois1
- Justice, Illinois1
- Kane County, Illinois1
- Kaneville, Illinois1
- Kankakee County, Illinois1
- Kendall County, Illinois1
- Kenilworth, Illinois1
- Kildeer, Illinois1
- Knollwood, Illinois1
- La Grange Park, Illinois1
- La Grange, Illinois1
- Lake Barrington, Illinois1
- Lake Bluff, Illinois1
- Lake Catherine, Illinois1