Statewide Wyoming Census records that exist are 1850 (as Utah Territory), 1860 (as Nebraska Territory), 1870, 1880, 1890 (fragment, see below), 1900, 1910, 1920, 1930 and 1940.
There are Industry and Agriculture Schedules 1870 and 1880. The Mortality Schedules for the years 1870 and 1880. The Union Veterans Schedules exist for 1890.
The 1851 residents of Fort Bridger were recorded in combination with the Green River Precinct, in the 1850 federal census. The Green River Precinct was located in Utah Territory, in Weber County. Although Green River County existed for a short time, it was abolished in 1868 and was never organized.
The census of Nebraska Territory’s unorganized regions included Fort Laramie residents. The first federal census that listed Wyoming as a territory was the 1870 census.
Yellowstone National Park was established by the time the 1880 census was taken. So, it was included in that year’s Wyoming Territory census, along with 7 Wyoming Territory counties. All of the Wyoming Territory 1880 census records still exist.
However, it is important to note that both Yellowstone National Park and Mammoth Hot Springs were recorded with the Uinta County census records for that year. There are indexes available for all census years, either online or in printed form.
The First Wyoming Territorial Census is often overlooked by researchers, but can be a valuable source of information. It was taken shortly after Wyoming became a territory.
The census includes resident names, places of origin, and how long they had resided in Wyoming as of the time that the census was taken. Both the FHL and the Wyoming State Archives have copies of that census on file.
The state archives has census records on file for Cheyenne Wyoming from 1875 through 1878. Those records include name, gender, age, occupation, nationality, and birthplace.