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Adams County, Illinois locator map 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. 

Quincy Products and Services Directory

Selected Quincy, Illinois Listings

These randomly selected Quincy listings provide some insight into the city's cultural environment and economic climate.

  • Televisions Retail
  • Big Screen Televisions Retail
Adams County School Superintendent
  • Public Schools
  • County Government
  • Educational Administration
Butcher Block
  • Butchers
  • Meat Cutting Services
Clean Air Filters
  • Building & Home Construction
  • Heating Contractors
  • Heating & Ventilating Contractors
Custom Building Systems
  • Builders & Contractors
  • Building Contractors
  • Metal Buildings Dealers
Double G Pest Control, Inc.
  • Pest Control Services
  • Pest Control Services Commercial & Industrial
  • Pest Control Information & Referral Services
Fairfield Inn By Marriott Quincy
  • Hotels
  • Hotel & Motel Reservations
Illinois School Supply Co
  • Office Furniture & Equipment Dealers
  • Crafts & Craft Supplies Retail
  • Art Supplies Retail
  • Craft Supplies
John Wood Community College
  • Colleges & Universities
  • Vocational Education
  • Junior Colleges & Technical Institutes
  • Institutional Libraries
Marlboro Wire
  • Metals
  • Metal Products
  • Metal Products Wholesale & Manufacturers
  • Metal Products Dealers
Quincy Area Chamber Of Commerce
  • Chambers of Commerce
Quincy Family Foot Care PC - Linda R Wensing DPM
  • Podiatry Physicians & Surgeons
River Valley Campground
  • Campgrounds & RV Parks
  • Camps
Town & Country Inn & Suites
  • Hotels
  • Banquet Facilities
  • Hotel & Motel Management

Nearby Illinois Cities and Towns *

* Parenthesized numbers indicate economic activity levels.

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