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Campbell County was named either for John Allen Campbell, a governor of the Wyoming Territory or for Robert Campbell, an early trapper, who was a fur trader associated with William Henry Ashley.
The cascades were named by Philetus Norris, park superintendent in 1881 for the 12 year old son of Wyoming's territorial governor John Wesley Hoyt.
John Allen Campbell (1835-1880), first Governor of the Wyoming Territory
John Allen Campbell (1835–1880), first Governor of the Wyoming Territory
Stephen Wheeler Downey (1839–1902), delegate to the United States House of Representatives from Wyoming Territory and "Father of the University of Wyoming"