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Cities
- Crystal Lake
- Harvard
- Marengo
- McHenry
- Woodstock (county seat)
Census-Designated Places
- Alden
- Big Foot Prairie
- Burtons Bridge
- Chemung
- Coral
- Franklinville
- Harmony
- Hartland
- Lawrence
- Pistakee Highlands
- Ridgefield
- Riley
- Solon Mills
Unincorporated Communities
- Belden
- Palm Beach (part)
- Silver Lake
- Terra Cotta
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Villages
- Algonquin (mostly)
- Barrington Hills (part)
- Bull Valley
- Cary
- Fox Lake (part)
- Fox River Grove (part)
- Greenwood
- Hebron
- Holiday Hills
- Huntley (part)
- Island Lake (part)
- Johnsburg
- Lake in the Hills
- Lakemoor (part)
- Lakewood
- McCullom Lake
- Oakwood Hills
- Port Barrington (part)
- Prairie Grove
- Richmond
- Ringwood
- Spring Grove
- Trout Valley
- Union
- Wonder Lake
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