La Plata County is one of the 64 counties in the U.S. state of Colorado. As of the 2010 census, the population was 51,334. The county seat is Durango. The county was named for the La Plata River and the La Plata Mountains. "La plata" is the Spanish language word for "silver".
La Plata County comprises the Durango, CO Micropolitan Statistical Area.