Standard is an unincorporated community in Tuolumne County, California, United States that lies 4 miles east-southeast of Sonora. Its post office, opened in 1910, is assigned ZIP code 95373. Standard was established as a company town for the Standard Lumber Company. Standard was a station on the former Sierra Railway, now Sierra Northern Railway th…Standard is an unincorporated community in Tuolumne County, California, United States that lies 4 miles east-southeast of Sonora. Its post office, opened in 1910, is assigned ZIP code 95373. Standard was established as a company town for the Standard Lumber Company. Standard was a station on the former Sierra Railway, now Sierra Northern Railway the depot has survived and is currently in use as a nursery and a grocery. Sierra Pacific Industries operates a mill in Standard.
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