State FIPS Code: 55
County FIPS Code: 105
County FIPS Class: H1
County Description:
| County Office Name | County Office Description | County Office Phone |
|---|---|---|
| City of Edgerton Assessor (City Only) | City of Edgerton Assessor (City Only) | |
| City of Janesville Assessor (City Only) | City of Janesville Assessor (City Only) | (608) 755 - 304 |
| Rock County Mapping/GIS | Rock County Mapping/GIS | |
| Rock County Register of Deeds | Rock County Register of Deeds | (608) 757 - 565 |
| Rock County Treasurer | Rock County Treasurer | (608) 757 - 567 |
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