Duncan is a town in Greenlee County, Arizona, United States. As of the 2010 census, the population of the town was 696. In 2015 the estimated population was 799. Duncan is in the Gila River valley, 4 miles (6 km) west of the Arizona-New Mexico border. The town limits are on both sides of the Gila, but the primary portion of the town and the entire downtown area lie on the south side of the river. Duncan was founded in the mid 19th century, and the land was added to the United States as a part of the Mexican Cession. The town of Duncan has been destroyed twice by flood and once by fire. The town and area are primarily populated by ranchers and miners (especially from the Freeport-McMoran copper mines in southeastern Arizona and southwestern New Mexico). Surrounding smaller towns such as Franklin and York in Arizona and Virden, New Mexico, use Duncan public works and public schools. The Duncan area along the Gila River is renowned for Native American artifacts such as arrow heads, pottery, burial sites, cave paintings and other remnants of the Anasazi and other pre-historic cultures, as well as artifacts from garrison camps of the expedition of Francisco Vázquez de Coronado. Duncan High School (mascot: Wildkats; school colors: red, grey, and white) competes in many sports, but is renowned for their football team. U.S. Supreme Court Justice Sandra Day O'Connor was born in El Paso, Texas, but grew up near Duncan on the Lazy B ranch, which straddles the border between Arizona and New Mexico. The Day family ran the ranch for many years until selling it; it continues to be run as a ranch. O'Connor later wrote a book titled Lazy B: Growing up on a Cattle Ranch in the American Southwest about her childhood experiences on the ranch with her brother H. Alan Day.
Duncan is located in southern Greenlee County at 32°43′33″N 109°5′52″W (32.725828, -109.097686). U.S. Route 70 passes through downtown, leading west 39 miles (63 km) to Safford, Arizona, and southeast 35 miles (56 km) to Lordsburg, New Mexico, and Interstate 10. Arizona State Route 75 leads north from Duncan 28 miles (45 km) to Clifton. According to the United States Census Bureau, the town of Duncan has a total area of 2.2 square miles (5.6 km²), all of it land.
As of the census of 2000, there were 812 people, 294 households, and 206 families residing in the town. The population density was 317.6 people per square mile (122.5/km²). There were 384 housing units at an average density of 150.2 per square mile (57.9/km²). The racial makeup of the town was 81.77% White, 0.49% Black or African American, 0.86% Native American, 0.12% Asian, 13.55% from other races, and 3.20% from two or more races. 31.53% of the population were Hispanic or Latino of any race.
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