Quincy, Illinois Map and Directory

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According to the United States Census Bureau, Quincy is a City that is located in Adams County, Illinois at 39.94 degrees North and 91.41 degrees West. The city's time zone is America/Chicago, and the city's primary telephone area code is 217. The land area of Quincy is about 15.87 square miles, whereas the water area of the city is about 0.04 square miles. Adams County's land area is about 855 square miles, so the city occupies about 1.9 percent of the county's total land area.

The Census Bureau estimates that Quincy had about 39,949 residents in 2019, which is approximately 2,517 people per square mile of land area.

According to recent American Community Survey data, the median household income in Quincy was about $46,189 per year.

The Illinois counties map at upper right shows Adams County, highlighted in red. Use the menu below to display interactive maps of Quincy, either in a frame on this page or in full-screen mode.

Use the menu below to display categorized Quincy directories.

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