- Hainesville (Population: 2,129)
- Hamilton (Population: 3,029)
- Hampshire (Population: 2,900)
- Hampton (Population: 1,626)
- Hanna City (Population: 1,013)
- Hanover Park (Population: 38,278)
- Harrisburg (Population: 9,860)
- Harristown (Population: 1,338)
- Hartford (Population: 1,545)
- Harvard (Population: 7,996)
- Harvey (Population: 30,000)
- Harwood Heights (Population: 8,297)
- Havana (Population: 3,577)
- Hawthorn Woods (Population: 6,002)
- Hazel Crest (Population: 14,816)
- Hebron (Population: 1,038)
- Henry (Population: 2,540)
- Herrin (Population: 11,298)
- Herscher (Population: 1,523)
- Heyworth (Population: 2,431)
- Hickory Hills (Population: 13,926)
- Highland (Population: 8,438)
- Highland Park (Population: 31,365)
- Highwood (Population: 4,143)
- Hillcrest (Population: 1,158)
- Hillsboro (Population: 4,359)
- Hillside (Population: 8,155)
- Hinckley (Population: 1,994)
- Hinsdale (Population: 17,349)
- Hodgkins (Population: 2,134)
- Hoffman Estates (Population: 49,495)
- Homer (Population: 1,200)
- Hometown (Population: 4,467)
- Homewood (Population: 19,543)
- Hoopeston (Population: 5,965)
- Hudson (Population: 1,510)
- Huntley (Population: 5,730)
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