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Gregg (formerly, Greenleaf) is an unincorporated community in Madera County, California. It is located on the Atchison, Topeka and Santa Fe Railroad 2.5 miles (4 km) south-southeast of Trigo, at an elevation of 299 feet (91 m).
The Greenleaf post office operated from 1904 to 1905. The Gregg post office opened in 1917, closed for a period in 1928, and closed for good in 1931.