Gillette is a city in and the county seat of Campbell County, Wyoming, United States. The population was estimated at 32,030 as of July 1, 2019. Gillette is centrally located in an area involved with the development of vast quantities of American coal, oil, and coalbed methane gas. The city calls itself the "Energy Capital of the Nation"; Wyoming provides nearly 35% of the nation's coal. Gillette's population increased 48% in the ten years after the 2000 census, which counted 19,646 residents.
Before its founding, Gillette started as Donkey Town, named after Donkey Creek, and then was moved and called Rocky Pile after Rocky Draw.
Gillette was founded in 1891 with the coming of the Chicago, Burlington & Quincy Railroad and incorporated on January 6, 1892, less than two years after Wyoming became a state. Chicago, Burlington & Quincy Railroad changed the name to Gillette for Edward Gillette, who worked as a surveyor for the company.
In November 1895, a fire destroyed most of Gillette. Only two saloons, two stores, and a restaurant survived.
In 1974, U.S. psychologist ElDean Kohrs used the town as the basic example of what he called the Gillette Syndrome, the social disruption that can occur in a community due to rapid population growth. During the 1960s, Gillette's population doubled from 3,580 to 7,194. Kohrs proposed that this fast increase caused increased crime, high costs of living, and weakened social and community bonds. Some of Kohrs's claims about the energy industry's influence have been disputed, since similar increases in divorce rates, welfare usage, and crime were also seen in other rapidly growing areas of the country.
Gillette annexed the census-designated place Antelope Valley-Crestview on January 1, 2018.