William A. "Jack" Morris arrived in 1886 and established the Morris Ranch. It was along the wagon route between Billings, Montana and Lander, Wyoming. The ranch became a wayside lodge for cattlemen and cowboys. In 1888 Morris had a daughter, Frannie.
In 1894, Morris established a post office at his ranch and named it for his daughter. The settlement had around 25 residents at the time. In 1900 the Chicago, Burlington and Quincy Railroad reached Frannie.
Until 1954, the legal status of Frannie was that of an unincorporated area taking in parts of Big Horn and Park Counties. In 1954, the town was incorporated. Under Wyoming law (WS 15-3-101), Frannie now has the status of an incorporated town having less than 4,000 people.
Founding dates: Wikidata, Wikipedia, the U.S. post office records of Blevins & Helbock (CC0) and the Census. Homes by year built: Census ACS 2020–24. National Register of Historic Places: National Park Service (list of May 22, 2026). Old photos, postcards and papers: Wikimedia Commons, the Library of Congress and other public archives, credited on each item’s page. Maps: U.S. Geological Survey historical topographic maps (via Esri) and Sanborn fire-insurance maps (Library of Congress). History text and census tables: Wikipedia (CC BY-SA 4.0). Places that used to be: USGS Geographic Names Information System (2021). How TownRatings grades history →
From Wikimedia Commons (1), the Library of Congress (1), Wikipedia, U.S. Geological Survey historical maps, U.S. Census counts (via Wikipedia), the US Post Offices dataset (Blevins & Helbock) and the USGS Geographic Names Information System. Archive images are copied here with their credits and licenses, shown on each photo’s page. Refreshed monthly.