Delaware, County Naturalization Records, 1796-1958 Description Naturalization records and digitized indexes from county courthouses in Delaware. The record content and time period vary by county. Learn more » View Images in this Collection Browse through 9209 images Citing this Collection "Delaware, County Naturalization Records, 1796-1958." Images. FamilySearch. http://FamilySearch.org : 14 June 2016. County courthouses, Delaware.