In 1911 Sunnyslope was founded when architect William R. Norton first platted land there for a planned subdivision.
In 1959 the City of Phoenix annexed the community of Sunnyslope along with many other valley areas. These areas became part of the City of Phoenix.
Arizona Attorney General Opinion 47-091
Arizona Attorney General Opinion 53-191
Financial investigation, Sunnyslope High School in the Glendale Union High School District--criminal indictment, theft and misuse of public monies : September 2018, Report 2018-404
Sunnyslope Post Office
Sunnyslope, Arizona
Sunnyslope 1st Annual Official Rodeo Program
The Sunnyslope Times
Sunnyslope High School