The P.E.O. Sisterhood is a U.S.-based international women's organization of about 230,000 members, with a primary focus on providing educational opportunities for female students worldwide. The Sisterhood is headquartered in Des Moines, Iowa, with chapters throughout the United States and Canada. Among other projects, it owns and supports Cottey College, an independent college for women in Nevada, Missouri.
The Sisterhood was founded on January 21, 1869, as a seven-member sorority at Iowa Wesleyan College in Mount Pleasant, Iowa. It was originally rooted in the philosophy and institutions of the Methodist Church, which actively promoted women's rights and education in America during the 19th century. Further chapters were founded, and in 1883 local chapters of the P.E.O. founded a "Supreme Chapter" to coordinate the Sisterhood on a national level. The first International chapter was established in Vancouver, British Columbia, Canada in 1911.
In 1966 the Sisterhood had 130,000 members. At that time membership was open to women over 18, who believed in God and had lived at their present address for a least a year. It was said to appeal to "Protestant women of some social standing and college education." Today, there are nearly 6,000 chapters and some 230,000 members.