Sinclair is a town in Carbon County, Wyoming, United States.
The town was originally called Parco, after the Producers & Refiners Corporation (or PARCO) which founded the refinery and the company town. It was renamed Sinclair after PARCO was acquired during the Great Depression by Sinclair Consolidated Oil Corporation. The original refinery, located just east of town, remains in use to this day. Sinclair's population was 433 at the 2010 census.
The town was built as a planned community in 1924-25, designed by Denver architects Fisher & Fisher in a Spanish Colonial Revival style. The historic center of town was designated the Parco Historic District in 1987.
Just six miles east of Sinclair is the ghost town site of Benton, Wyoming at milepost 672.1 of the Union Pacific Railroad. As the terminal of the railroad at the time, Benton had a colorful three-month history which ended in September 1868 with a visit from Republican presidential candidate Ulysses S. Grant and the departure of the final overland wagon trains on the Mormon Trail headed for the Salt Lake Valley before completion of the railroad the following year.
Three miles east of the Benton site is Fort Fred Steele State Historic Site. The original Ft.