Avery is a census-designated place in Calaveras County, California, United States. The population was 646 at the 2010 census, down from 672 at the 2000 census. Avery is located on State Route 4 and is home to the oldest continually operating hotel in the county, the Avery Hotel Restaurant& Saloon. Built in 1853, it was known as the "Half Way House," being located between Murphys, Arnold, and Calaveras Big Trees State Park.