Gertrude (also, String Town) is a former settlement in Madera County, California. It was located alongside the Fresno River near Enterprise Mine, 2 miles (3.2 km) south of Ahwahnee.
Originally String Town, the name was changed to Gertrude when the post office opened. The Gertrude post office operated from 1881 to 1893, from 1896 to 1900, when the service was transferred to Ahwahnee, with a move in 1899. The name honored Gertrude Haley, the town's first postmaster.
References
Gertrude, California Wikipedia(Text) CC BY-SA