24/7 Trauma and Biohazard Cleanup in Duncan, AZ

Duncan is an incorporated town in Greenlee County, Arizona, and one of only two incorporated towns in the county, along with Clifton.

Duncan was founded in 1883 alongside the railroad and was named after James Duncan Smith, a director of the Scottish-based Arizona Copper Company; the town incorporated in 1938.

The population of Duncan was 694 at the 2020 census, nearly unchanged from 696 at the 2010 census.

At the 2000 census, Duncan had 812 residents living in 294 households.

Duncan lies in the Gila River valley about four miles west of the Arizona-New Mexico state line, and although the town limits extend to both sides of the Gila River, the downtown sits on the river's south side.

The town of Duncan has been destroyed twice by flooding and once by fire over the course of its history.

Duncan's surrounding country is populated mainly by farming, ranching, and mining families, with many residents tied to Freeport-McMoRan's Morenci and Safford copper mines.

U.S. Route 70 passes through downtown Duncan, leading west to Safford and southeast to Lordsburg, New Mexico, while Arizona State Route 75 leads north to Clifton.

Duncan High School, whose teams are the Wildkats, also serves students from the surrounding unincorporated settlements and from Virden, New Mexico.

U.S. Supreme Court Justice Sandra Day O'Connor grew up near Duncan on the Lazy B Ranch, which straddles the Arizona-New Mexico border, and later wrote the memoir Lazy B about her childhood there.