P.E.O. began in Wyoming when Effie Murchison, a teacher in Rawlins, asked her Iowa chapter for permission to charter a new chapter. On March 23, 1906, Chapter A/WY came to fruition. Think of Wyoming P.E.O. as a mighty cottonwood tree with Chapter A forming the mother root and chapters B, Sheridan (1907) and C, Cheyenne, (1909) and D, Cody (1909) as the supporting roots. Through 1920, our tree grew and chapters E through K formed the trunk. Our state chapter was formed on May 2, 1921 and our tree began to leaf out adding chapters L through Z by 1944, chapters AA to AZ by 1982, and BA to BL by 2014 with buds to grow. Our newest chapter BM, chartered on May 11, 2024, shows how our Sisterhood continues to grow across our state even today. Thanks to Miss Effie Murchison, who missed the friendships, ideals and standards P.E.O. provided, and worked to establish her P.E.O. roots in our wonderful state.
 – Helen Sheppard, Past State President, Past Wyoming State Historian