Mchenry County Illinois is covered by a total of 23 ZIP Codes. There are 12 ZIP Codes in Mchenry County that extend into adjacent counties (Boone County, Cook County, DeKalb County, Kane County, and Lake County). Of the ZIP codes within or partially within Mchenry County there are 21 Standard ZIP Codes and 1 PO Box ZIP Codes.
Click on the ZIP Codes in the interactive map to view more information. The map control in the upper right corner can be used to toggle map layers on and off. The red outline is the border of Mchenry County and can be turned on and off. Each type of postal code can also be turned on and off.
| ZIP Code | ZIP Code City/Town | ZIP Code Type | |||
|---|---|---|---|---|---|
| Barrington | Standard | |||
| Crystal Lake | Standard | |||
| Cary | Standard | |||
| Crystal Lake | Standard | |||
| Fox River Grove | Standard | |||
| Harvard | Standard | |||
| Hebron | Standard | |||
| Crystal Lake | PO Box | |||
| Island Lake | Standard | |||
| Mchenry | Standard | |||
| Mchenry | Standard | |||
| Richmond | Standard | |||
| Ringwood | Standard | |||
| Spring Grove | Standard | |||
| Wonder Lake | Standard | |||
| Woodstock | Standard | |||
| Algonquin | Standard | |||
| Genoa | Standard | |||
| Huntley | Standard | |||
| Marengo | Standard | |||
| Lake in the Hills | Standard | |||
| Union | Standard | |||
| Garden Prairie | Standard |