Columbia County, Wisconsin

Columbia County is a county in the U.S. state of Wisconsin. As of 2000, 52,468 people lived in Columbia county. Portage is the county seat and largest city in the county.
Columbia County is part of the Madison Metropolitan Statistical Area.
Geography.
The county has a total area of . Of this, is land and (2.75%) is water. The county's highest point is Gibraltar Rock. It is above sea level. The high butte-shaped bluff is located north of Lodi. It looks out over the Lake Wisconsin River valley.