Many Wyoming Post Offices were discontinued on December 31. Here are four that were established, or renamed.1883 The Granite Canyon Post Office was re-established as Granite Canon Post Office on December 31, 1883.
1868 Percy Post Office was one that was created. It was established on December 31, 1868 in Laramie County (now in Carbon County), Dakota Territory. Percy was named for Percy T. Brown, an engineer with the Union Pacific Railroad.