Catheys Valley (formerly, Cathay and Cathey's Valley) is an unincorporated community in Mariposa County, California. It lies in Catheys Valley 22 miles (35.2 km) northeast of Merced, and 8 miles (13 km) southwest of Mariposa, at an elevation of 1325 feet (404 m). Catheys Valley has a population of 1,007. Catheys Valley was named after Andrew Cathey, a native of North Carolina, who settled in this valley around 1850. The ZIP Code is 95306. The community is inside area code 209.
The first Catheys Valley post office opened in 1879, and closed in 1881. The Cathay post office opened in 1882, closed in 1918, re-opened in 1919, and changed its name to Catheys Valley in 1964.
In the state legislature Catheys Valley is located in the 14th Senate District, represented by Republican Dave Cogdill, and in the 25th Assembly District, represented by Republican Tom Berryhill. Federally, Catheys Valley is located in California's 19th congressional district, which has a Cook PVI of R +10 and is represented by Republican George Radanovich.