1860 On May 31, 1860, Captain William F. Raynolds, while exploring the Yellowstone and Missouri Rivers, journeyed up the Wind River to its source. "To the left of our route and some 10 miles from it rises a bold conical peak, 3,000 or 4,000 feet above us. That peak I regard as the topographical centre of the continent, the waters from its sides flowing into the Gulf of Mexico, the Gulf of California and the Pacific Ocean. I named it Union Peak and the Pass Union Pass."
1889 Bellewood Post Office in Platte County was established on May 31, 1889.1929 Lindbergh Post Office in Laramie County was established on May 31, 1929. The locale was named for Charles A. Lindbergh.
1914 On May 27, 1914, the Cheyenne State Leader reported on the results of the sale of lots in the "new town" of Chugwater. Chugwater wasn't new. It had been a post office since 1872 and a railroad station on the Cheyenne Northern Railroad since 1887. This growth was a result of the dry farming that was occurring in the area.
1894 Frederick Post Office was established on May 25, 1894 in Laramie County prior to the formation of Goshen County. Minnie Frederick was the first postmaster.
1963 The Wapiti Ranger Station was designated a national landmark on May 23, 1963. It was constructed in 1903 in the Shoshone National Forest Reserve, the first National Forest.
1902 On May 22, 1902, President Theodore Roosevelt issued three proclamations regarding forests in Wyoming. Proclamation 473 established the Yellowstone Forest Reserve by combining the Yellowstone Park Timber Land Reserve and the Teton Forest Reserve. Proclamation 474 established the Medicine Bow Forest Reserve. Proclamation 475 enlarged the Big Horn Forest Reserve.1914 Armenta (Arminto) and Wolton were in the news.