'''5 January 1856:''' Cache County was created from part of the area of old Green River County of the former Utah Territory and unorganized territory. <ref>''Handybook for Genealogists: United States of America, 10th ed.''; Draper, Utah: Everton Pub., 2002 {{WorldCat|50140092}}, {{FHL|1049485|item|disp=FHL Book 973 D27e 2002}}</ref>