18 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 60014 | Crystal Lake | 48,568 |
| 60098 | Woodstock | 33,116 |
| 60102 | Algonquin | 32,227 |
| 60050 | Mchenry | 31,820 |
| 60142 | Huntley | 29,449 |
| 60156 | Lake In The Hills | 28,958 |
| 60013 | Cary | 26,266 |
| 60051 | Mchenry | 23,598 |
| 60033 | Harvard | 13,574 |
| 60152 | Marengo | 12,264 |
| 60097 | Wonder Lake | 11,865 |
| 60012 | Crystal Lake | 11,736 |
| 60081 | Spring Grove | 9,194 |
| 60021 | Fox River Grove | 5,199 |
| 60071 | Richmond | 3,938 |
| 60034 | Hebron | 2,061 |
| 60180 | Union | 1,721 |
| 60072 | Ringwood | 959 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 18 ZCTAs in McHenry County, Illinois (US Census).