Green Valley is a former settlement in El Dorado County, California. It was located 3.25 miles (5 km) north-northwest of Shingle Springs. Later named Rescue, California in 1895 by the request to local residences by the US Postal Service because there were 4 post offices named Green Valley in California at the time. Also see Green Springs Ranch, California and Hitchcock Ranch, California.
This early post office was located on the Green Valley Ranch, a supply center for the local mines and also on the main route from Sacramento to Coloma, California seven miles southeast of Salmon Falls, California and ten miles south of Lotus, California. Nelson Van Tassel was named the first postmaster when the post office opened on Feb. 4, 1854.
On Mar. 30, 1855, this still young post office was discontinued, probably because of downturn in mining. On Sep. 12, 1865 the Green Valley Post Office was reestablished by renaming the Hitchcock Ranch Post Office, which was located on the Hitchcock Ranch, California a short distance away from the Green Valley Ranch. On Dec. 12, 1908, the post office was moved one and one-half miles to the east. Then, on Oct. 14, 1911, it was discontinued and the mail moved to the post office in Rescue.
A post office operated at Green Valley from 1854 to 1855 and 1865 (transferred from Hitchcock Ranch) to 1911, with a move in 1908.