From a total population of 22,617, Duncan has a median age of 38.7. The average age of males, in Duncan, is 36.5 while the average age of females is 40.1. When you compare this to median age of Oklahoma, Duncan is 2.5 years older.
The median income of individuals, in Duncan, is $22,605 while the average household income is $40,171. When comparing the median income of people living in Duncan to the rest of Oklahoma, the average income in Duncan is $2,090 less.