Duncan is a city located in Arizona. With a 2020 population of 755, it is the 87th largest city in Arizona and the 11552nd largest city in the United States. Duncan is currently declining at a rate of -2.20% annually but its population has increased by 8.48% since the most recent census, which recorded a population of 696 in 2010. Duncan reached it's highest population of 807 in 2016. Spanning over 2 miles, Duncan has a population density of 351 people per square mile.
The average household income in Duncan is $62,492 with a poverty rate of 25.23%. The median rental costs in recent years comes to $658 per month, and the median house value is $67,100. The median age in Duncan is 50.8 years, 46.8 years for males, and 53.6 years for females. For every 100 females there are 110.8 males.