Pierce County, Wisconsin: History
Native Americans were the first to live in what became Pierce County, as evidenced in the burial mounds near Diamond Bluff. Evidence indicates that this area has been inhabited for 10,000 to 12,000 years. In 1840, St. Croix County covered a large portion of northwest Wisconsin Territory. In 1853, the Wisconsin State Legislature split St. Croix County into Pierce, Polk, and Saint Croix counties. Pierce County was named for Franklin Pierce, the 14th president of the United States.