
Duncan
- County:
- Greenlee County
- County Seat:
- No
- Area (mi²):
- 2.152
- State:
- Arizona
Duncan is a town located in Greenlee County, Arizona. Duncan has a 2025 population of 657. Duncan is currently declining at a rate of -0.9% annually and its population has decreased by -4.64% since the most recent census, which recorded a population of 689 in 2020.
The average household income in Duncan is $59,550 with a poverty rate of 29.83%. The median age in Duncan is 35.2 years: 35 years for males, and 35.3 years for females.