Cities in State of Illinois, United States ( 474 )
- Hazel Crest
- Herrin, Illinois
- Heyworth
- Hickory Hills, Illinois
- Highland, Illinois
- Highland Park, Illinois
- Highwood, Illinois
- Hillsboro, Illinois
- Hillside, Illinois
- Hinsdale, Illinois
- Hoffman Estates
- Holiday Shores
- Homer Glen
- Hometown, Illinois
- Homewood, Illinois
- Hoopeston
- Huntley, Illinois
- Indian Head Park
- Ingalls Park
- Inverness, Illinois
- Island Lake, Illinois
- Itasca, Illinois
- Jacksonville, Illinois
- Jerseyville, Illinois
- Johnsburg, Illinois
- Johnston City
- Joliet
- Justice, Illinois
- Kankakee, Illinois
- Kenilworth, Illinois
- Kewanee, Illinois
- Kildeer, Illinois
- Knoxville, Illinois
- La Grange, Illinois
- La Grange Park
- Lake Barrington