Sly Park is an unincorporated community in El Dorado County, California. It is located in Sly Valley 13 miles (21 km) east of Placerville, at an elevation of 3560 feet (1085 m).
A post office operated at Sly Park from 1891 to 1919, with several moves. The name honors James Sly, one of the Mormons who discovered Sly Valley.
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