Why is an unincorporated rural community in Pima County, Arizona, United States. It lies near the western border of the Tohono Oʼodham Indian Reservation and due north of Organ Pipe Cactus National Monument in Southern Arizona. It is approximately 30 miles north of the Mexican border where Lukeville, Arizona, and Sonoyta, Sonora, Mexico, border each other, and 10 miles south of Ajo, Arizona. The population in Why at the 2020 census was approximately 122.