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As of the 2010 United States Census, Quincy, located in the Prairie State, had a total population of 39,983 people.
From a total population of 39,983, Quincy has a median age of 38.3. The average age of males, in Quincy, is 36.6 while the average age of females is 39.4. When you compare this to median age of Illinois, Quincy is 1.3 years older.
The median income of individuals, in Quincy, is $22,995 while the average household income is $40,886. When comparing the median income of people living in Quincy to the rest of Illinois, the average income in Quincy is $7,024 less.