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 in the center of the town, remains in use to this day. Sinclair's population was 423 at the 2000 census.