Adams County is the westernmost county in the U.S. state of Illinois. As of the 2020 census, the population was 65,737. Its county seat is Quincy. Adams County is part of the Quincy, IL–MO Micropolitan Statistical Area.
History
Adams County was formed in 1825 out of Pike County. Its name is in honor of the sixth President of the United States, John Quincy Adams.
Geography
According to the U.S. Census Bureau, the county has a total area of , of which is land and (1.9%) is water.
Adjacent counties
Hancock County - north
Brown County - east
Schuyler County - east
Pike County - south
Marion County, Missouri - west
Lewis County, Missouri - west
Public transit
Quincy Transit Lines
Quincy station
Burlington Trailways
List of intercity bus stops in Illinois
Major highways
Interstate 172
US Route 24
US Route 36
Illinois Route 57
Illinois Route 61
Illinois Route 94
Illinois Route 96
Illinois Route 104
Illinois Route 336
National protected area
Great River National Wildlife Refuge (part)
Climate and weather
In recent years, average temperatures in the county seat of Quincy have ranged from a low of in January to a high of in July, although a record low of was recorded in January 1979 and a record high of was recorded in July 2005. Average monthly precipitation ranged from in January to in May.
Demographics
As of the 2020 United States Census, there were 65,737 people, 27,199 households, and 17,398 families residing in the county. The population density was . There were 30,235 housing units at an average density of . The racial makeup of the county was 89.5% white, 3.8% black or African American, 0.8% Asian, 0.2% American Indian, 0.8% from other races, and 4.9% from two or more races. Those of Hispanic or Latino origin made up 2.0% of the population. The most common reported ancestries were, German (35.9%), Irish (11.1%), English (8.1%), and American (7.4%).
Of the 27,199 households, 25.1% had children under the age of 18 living with them, 50.2% were married couples living together, 9.8% had a female householder with no husband present, 36.0% were non-families. 30.5% of all households were made up of individuals, and 15.4% had someone living alone who was 65 years of age or older. The average household size was 2.36 and the average family size was 2.95.
In the county, the population was spread out, with 22.6% under the age of 18, 7.5% from 18 to 24, 23.7% from 25 to 44, 25.9% from 45 to 64, and 20.2% who were 65 years of age or older. The median age was 41.4 years. For every 100 females, there were 96.4 males. For every 100 females age 18 and over, there were 93.5 males.
The median income for a household in the county was $55,052 and the median income for a family was $72,091. Males had a median income of $41,852 versus $29,404 for females. The per capita income for the county was $31,035. About 9.4% of families and 12.5% of the population were below the poverty line, including 17.7% of those under age 18 and 9.9% of those age 65 or over.
2020 Census
Communities
City
Quincy (seat)
Villages
Camp Point
Clayton
Coatsburg
Columbus
Golden
La Prairie
Liberty
Lima
Loraine
Mendon
Payson
Plainville
Ursa
Unincorporated communities
Adams
Beverly
Bigneck
Blacks
Bloomfield
Burton
Chatton
Cliola
Country Meadows
Ewbanks
Fall Creek
Fowler
Hickory Grove
Kellerville
Kingston
Marblehead
Marcelline
Meyer
North Quincy
Paloma
Richfield
Rock Creek
Sheridan Estates
Spring Valley
Woodville
Townships
Adams County is divided into twenty-three townships: