1869 Laramie County was created on January 9, 1867.
1888 Lonetree Post Office in Uinta County was established on January 9, 1888. It was originally named Lone Tree. According to early Wyoming Business Directories, farming and stockraising were the principal industries. A weekly column titled "Lonetree Scrapings" appeared in the Evanston newspaper Wyoming Press in the early 1900s. In 2010, the population of Lonetree was 49.