The unusual name comes from the fact that at one time, two major highways (Highway 85 and Highway 86) intersected in a Y. The spot became known as "The Y," and the spelling was changed when residents petitioned for a post office. At the time of the town's naming, Arizona law required town and city names to have at least three letters, so the town founders decided to name it Why because they could not just call it Y.

As a former copper mining hub, Ajo is a casual town with relaxed charm, mild climate, low humidity and clear skies. Ajo has historic Spanish Colonial Revival architecture, Sonoran Desert flora and fauna and panoramic views. Ajo is located on State Route 85 just 43 miles from the Mexican border and is the birthplace of copper mining in Arizona. Population: 3,705 (2000)