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", is a city on the Mississippi River and county seat of Adams County, Illinois, United States. As of the 2000 census the city had 40,366 people. The community is a river city and was built on top of the bluffs. Quincy serves as the economic and cultural hub of West-Central Illinois and is the primary city of the Quincy, IL–MO Micropolitan Statistical Area.
During the 1800s the city was a stop on the Underground Railroad. It also sheltered hundreds of Mormons during their exile from Missouri. Today, Quincy is a thriving mid-sized industrial city that prides itself on its German heritage as well as its artistic expressions.
As of the census of 2000, there were 40,366 people, 16,546 households, and 10,109 families residing in the city. The population density was 2,761.2 people per square mile (1,066.0/km²). There were 18,043 housing units at an average density of 1,234.2/sq mi (476.5/km²). The racial makeup of the city was 93.02% White, 4.65% African American, 0.19% Native American, 0.54% Asian, 0.01% Pacific Islander, 0.36% from other races, and 1.22% from two or more races. Hispanic or Latino of any race were 0.94% of the population.
There were 16,546 households out of which 28.6% had children under the age of 18 living with them, 46.3% were married couples living together, 11.6% had a female householder with no husband present, and 38.9% were non-families. 33.7% of all households were made up of individuals and 15.3% had someone living alone who was 65 years of age or older. The average household size was 2.30 and the average family size was 2.94.
In the city the population was spread out with 23.4% under the age of 18, 10.0% from 18 to 24, 25.8% from 25 to 44, 20.9% from 45 to 64, and 19.9% who were 65 years of age or older. The median age was 38 years. For every 100 females there were 88.3 males. For every 100 females age 18 and over, there were 85.3 males.
The median income for a household in the city was $30,956, and the median income for a family was $40,718. Males had a median income of $30,734 versus $20,748 for females. The per capita income for the city was $17,479. About 9.2% of families and 12.2% of the population were below the poverty line, including 15.2% of those under age 18 and 8.3% of those age 65 or over.