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 Johnstown (Rock 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 Type | Median Household Income(2021) | |||
|---|---|---|---|---|---|---|
| Darien | Standard | $66,458 | |||
| Whitewater | Standard | $52,823 | |||
| Avalon | Standard | $85,313 | |||
| Janesville | Standard | $63,695 | |||
| Milton | Standard | $80,370 |