Hornitos, 'little ovens,' derived its name from the presence of many old Mexican stone graves or tombs built in the shape of little square bake ovens and set on top of the ground. The town seemed to have been settled by an undesirable element driven out of the adjoining town of Quartzburg, but as the placers at Quartzburg gave out, many of its other citizens came to Hornitos. It became the first and the only incorporated town in Mariposa County.

Citation from California Office of Historic Preservation