| Official Zip Code Name | Janesville |
| Zip Code State | Wisconsin |
| Primary County: | Rock |
| Area Code | 608 |
| Current Population: | 37081 |
| Racial Majority: | White 62.49% |
| Median Household Income | $55618 |
| Average Adjusted Gross Income | $89060 |
| Time Zone: | 6 |
| Elevation Range | 892 ft. |
| Area | 22.507 Sqm. |
| Coordinates(Y,X) | 42.728275, -89.050274 |