Place
- Highwood, Illinois1
- Hinsdale, Illinois1
- Hoffman Estates, Illinois1
- Holiday Hills, Illinois1
- Homer Glen, Illinois1
- Homewood, Illinois1
- Huntley, Illinois1
- Indian Creek, Illinois1
- Ingalls Park, Illinois1
- Inverness, Illinois1
- Island Lake, Illinois1
- Itasca, Illinois1
- Johnsburg, Illinois1
- Joliet, Illinois1
- Kane County, Illinois1
- Kaneville, Illinois1
- Kankakee County, Illinois1
- Kendall County, Illinois1
- Kenilworth, Illinois1
- Kildeer, Illinois1