Gertrude is a former settlement in Madera County

Madera County, California

Madera County is a county of the U.S. state of California, located in the Central Valley and the Sierra Nevada north of Fresno County. It comprises the Madera-Chowchilla, CA Metropolitan Statistical Area. As of the 2010 census the population was 150,865...

, California

California

California is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third-largest by land area...

. It was located alongside the Fresno River

Fresno River

The Fresno River is a river in Central California and a major tributary of the San Joaquin River. It runs approximately from the Sierra Nevada Range to the San Joaquin River.-Course:...

 near Enterprise Mine, 2 miles (3.2 km) south of Ahwahnee

Ahwahnee, California

Ahwahnee is a census-designated place in Madera County, California. It is located west of Yosemite Forks, at an elevation of 2326 feet . The population was 2,246 at the 2010 census....

.

Originally String Town, the name was changed to Gertude 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 Gerturde Haley, its first postmaster.