Bonanza, Colorado

The Town of Bonanza is a Statutory Town located in Saguache County, Colorado, United States. Formerly known as Bonanza City, Bonanza is a largely abandoned former silver mining town. Bonanza is a Spanish language word meaning a rich mineral deposit. The town population was 16 at the 2010 Census, making Bonanza the second least populous incorporated town in the State of Colorado. The Villa Grove Post Office (ZIP Code 81155) now serves Bonanza.