Crosby is a city in Crow Wing County, Minnesota, United States. The population was 2,386 at the 2010 census. It is part of the Brainerd Micropolitan Statistical Area. Crosby is adjacent to its twin city of Ironton, in the Cuyuna iron range.
Crosby was built for the sole purpose of mining. It was named for George H. Crosby, a businessman in the mining industry.
Crosby was the location of Minnesota's worst mining disaster, the Milford Mine disaster. On February 5, 1924, a new tunnel was blasted too close to nearby Foley Lake, and water rushed in, killing 41 miners.
In the 1932 local elections, Karl Emil Nygard was elected president of Crosby's Village Council, making it the first city in the United States to have a Communist mayor.
In August 1957, David G. Simons, a 35-year-old Air Force major, climbed to nearly 102,000 feet (31,000 m) above the earth as part of Project Manhigh. The flight, which was launched from Crosby's 400-foot-deep (120 m) Portsmouth Mine Pit Lake, helped the United States take its fledgling steps into space exploration.