Sunnyside is a populated place situated in the far west of Cochise County, Arizona, United States, located just north of the international border with Mexico.

[2] It has an estimated elevation of 5,814 feet (1,772 m) above sea level.

[1] Sunnyside was founded as a religious commune by Samuel Donnelly.

In 1900, Donnelly became sick with Bright's disease and died on April 14, 1901.

[4] Although designated officially as a 'populated place', there are no inhabitants, and Sunnyside is known locally as a ghost town.