Top-of-the-World is a census-designated place (CDP) in Gila and Pinal counties in the U.S. state of Arizona.

According to the United States Census Bureau, the CDP has a total area of 6.1 square miles (15.7 km2), all land.

[4][incomplete short citation] These Mountains were home to the Western Apache Pinal Band of Native Americans, whom the US Military found particularly vexing for their frequent raids to surrounding settlements, ranches, and mines.

The original camp, called Infantry Camp, was located four miles southeast of Mason’s Valley on the divide between Mineral Creek and Pinto Creek at the location of the future Gibson Mine and Bellevue settlement.

…estimated distance from Camp Grant, fifty-two miles.”[8][incomplete short citation] “…Stores continue to arrive regular per ‘Hog Express’ as package was marked”.

[10][incomplete short citation] The site was abandoned in late in 1871, the last printed mention of troops there was October 20.

The trail traveled north from Camp Picket Post, up the face of Kings Crown Mountain, around the peak across the headwaters of Queen Creek, across Oak Flats, Devil's Canyon, and up Irion Canyon to Camp Pinal.

In 1877 they produced 30,000 pounds of potatoes.”[12][incomplete short citation] Hospitality business was good providing shelter and food for travelers on the Stoneman Trail to Globe.

His stepson Dudley Craig continued the ranching tradition in the area after Irion's death.

[13][incomplete short citation] As of the census[15] of 2000, there were 330 people, 130 households, and 82 families residing in the CDP.