| Capital: | Woodstock |
|---|---|
| Origen y Formación del condado: | Cook and LaSalle County |
| Población: | 308,760 habitantes |
| Área: | 604 sq mi |
| Localización del condado dentro de Illinois: |
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Localidades en McHenry, Illinois
- Alden Township Mchenry County
- Algonquin
- Algonquin Township Mchenry County
- Barrington Hills
- Bull Valley
- Burton Township Mchenry County
- Cary
- Chemung Township Mchenry County
- Coral Township Mchenry County
- Crystal Lake
- Dorr Township Mchenry County
- Dunham Township Mchenry County
- Fox Lake
- Fox River Grove
- Fox River Valley Gardens
- Grafton Township Mchenry County
- Greenwood
- Greenwood Township Mchenry County
- Hartland Township Mchenry County
- Harvard
- Hebron
- Hebron Township Mchenry County
- Holiday Hills
- Huntley
- Island Lake
- Johnsburg
- Lakemoor
- Lakewood
- Lake In The Hills
- Marengo
- Marengo Township Mchenry County
- Mccullom Lake
- Mchenry
- Mchenry Township Mchenry County
- Nunda Township Mchenry County
- Oakwood Hills
- Pistakee Highlands
- Prairie Grove
- Richmond
- Richmond Township Mchenry County
- Riley Township Mchenry County
- Ringwood
- Seneca Township Mchenry County
- Solon Mills
- Spring Grove
- Trout Valley
- Union
- Wonder Lake
- Wonder Lake Cdp
- Woodstock