Gilbert is a town in Maricopa County, Arizona, United States, located southeast of Phoenix within the city's metropolitan area. Once known as the "Hay Shipping Capital of the World", it is the fifth-largest municipality in Arizona, and the fourth-largest in the Phoenix metro area. It covers an area of nearly 69 square miles (179 km2).
Gilbert has made a rapid transformation from an agriculture-based community to an economically diverse suburban center located in the southeastern valley of the Greater Phoenix area. It has grown at an extremely high rate over the last three decades, increasing in population from 5,717 in 1980 to 243,254 as of the 2020 census. The town grew at an average annual rate of nearly 13% during this 30-year period. In 2019, the town's population was estimated to be 254,114. It is the largest incorporated town in the United States.


Gilbert is a rapidly growing suburb of Phoenix, and has the largest land area in Maricopa County. It also has the highest median household income of any town with a population over 50,000 within Arizona. The town's slogan is "The Town Too Busy to Hate".
The first people to settle in what later became Gilbert were Hohokam Indians who lived near the Gila River from approximately AD 700–1450.

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