Platteville is a Statutory Town in Weld County, Colorado, United States. The population was 2,485 at the 2010 census. It is adjacent to Fort Vasquez on U.S. Highway 85.
Platteville was founded on May 27, 1871, and was incorporated on January 1, 1887. The town was named for its location on the Platte River.
Platteville is located at 40°12′52″N 104°49′27″W (40.214468, -104.824070).
The town is situated along the east bank of the South Platte River at the intersection of U.S. Highway 85 and State Highway 66.
The Fort St. Vrain Generating Station, originally a nuclear power plant and now operating as a natural gas powered electricity generating facility operated by Xcel Energy, is approximately one-quarter-mile northwest of Platteville.
According to the United States Census Bureau, Platteville has a total area of 2.527 square miles (6.54 km2), all of it land.
At the 2010 census there were 2,485 people, 951 households, and 935 families residing in Platteville. The population density was 1,606.5 people per square mile (618.3/km²).