Platteville is a Statutory Town in Weld County, Colorado, United States. The population was 2,955 at the 2020 census. It is adjacent to Fort Vasquez on U.S. Highway 85.

Fort Vasquez is a former fur trading post 35 miles (56 km) northeast of Denver, Colorado, United States, founded by Louis Vasquez and Andrew Sublette in 1835. Restored by the Works Progress Administration in the 1930s, it now lies in a rather incongruous position as U.S. Route 85 splits to run either side of the building. History Colorado took possession of the property in 1958 and runs it as a museum to display exhibits of the fur-trade era.