July 7

1879 Rochester Post Office in Johnson County was first established as Fort McKinney Post Office, yet renamed to Rochester on July 7, 1879. It was changed back to Fort McKinney in 1882.

1911 On July 7, 1911, Marbleton Post Office was established.

Portion of the Map of the Territory of Wyoming
Portion of map of Territory of WyomingGeneral Land Office, 1879