Wisconsin, County Naturalization Records, 1807-1992 Description Naturalization records and digitized indexes from county courthouses in Wisconsin. The record content and time period varies by county. Learn more » View Images in this Collection Browse through 1135393 images Citing this Collection "Wisconsin, County Naturalization Records, 1807-1992." Images. FamilySearch. http://FamilySearch.org : 14 June 2016. County courthouses, Wisconsin.