Gilbert, Arizona vs Glendale, Arizona Size in Square Miles Glendale, Arizona’s size is 65.1 square miles, and Gilbert, Arizona’s size is 68.8 square miles. This means that Gilbert’s size is about 1.1 times as large as Glendale’s. Put another way, Glendale’s size is about 95% of Gilbert’s. Glendale, Arizona vs Gilbert, Arizona Population Graphed Glendale, […]