Adams County, Illinois
Adams County, Illinois, has 64,267 residents (July 2025 estimate). Its county seat is Quincy. It uses Central Time and covers 855 sq mi (2,215 km²) of land.
- Resident population, July 2025
- 64,267
- Land area
- 855 sq mi (2,215 km²)
- County seat or government
- Quincy
- Time zone
- Central TimeUTC-06:00 in January; UTC-05:00 in July
- Median household income
- $66,220 ± $3,435
- Median home value
- $162,600 ± $4,166
- Median rent, with utilities
- $828 ± $43
- Homes lived in by their owners
- 72.1% ± 1.6 points
- County type
- County
- Metro or micro area
- Quincy, IL-MO micro areaCentral county
- Water area
- 16.1 sq mi (41.8 km²)
- State
- Illinois
- County code (FIPS)
- 17001
- Coordinates (central point)
- 39.986052, -91.194961
These coordinates mark a central point for the area, not a street address. Income, home value, rent and homes lived in by their owners: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 13, 2026.
Time zones in Adams County
| Time zone | Local time and UTC offset | Next clock change |
|---|---|---|
| Central TimeAmerica/Chicago | UTC-06:00 in January; UTC-05:00 in July. Enable JavaScript for the live clock. | Enable JavaScript for upcoming changes. |
Near a time-zone line, check where you are with the time-zone finder. Your phone’s setting can differ.
ZIP Code areas, largest first
- 6230130,746 people
- 6230519,036 people
- 623202,667 people
- 623471,977 people
- 623121,931 people
- 623511,928 people
- 623791,854 people
- 623601,605 people
- 623761,276 people
- 623241,196 people
- 623381,075 people
- 62339970 people
All 23
23 ZIP Code areas overlap Adams County. People counts are 2020–2024 estimates for each whole ZIP area. Mailing ZIPs can differ; check an address with USPS ZIP Code Lookup.
Official county information
We don’t have a website for this county yet. The US government’s local-office directory ↗ lists its offices. A geographic lookup cannot determine eligibility, tax liability or a court obligation.
Townships in Adams County, largest first
- Quincy Township39,109 people
- Melrose Township5,560 people
- Ellington Township2,755 people
- Riverside Township2,060 people
- Payson Township1,928 people
- Camp Point Township1,801 people
- Mendon Township1,675 people
- Liberty Township1,251 people
- Northeast Township1,063 people
- Ursa Township1,024 people
- Gilmer Township988 people
- Columbus Township852 people
All 23
- Honey Creek Township757 people
- Clayton Township752 people
- Burton Township627 people
- Lima Township593 people
- Keene Township537 people
- Concord Township432 people
- Richfield Township316 people
- Beverly Township238 people
- Houston Township173 people
- Fall Creek Township153 people
- McKee Township110 people
People counts are American Community Survey 2020–2024 5-year estimates. All townships in Illinois, by county
School districts in Adams County, largest first
- Quincy School District 17249,345 people
- Central CUSD 35,485 people
- Community Unit School District 44,095 people
- Western Community Unit School District 123,399 people
- Southeastern Community Unit School District 3373,120 people
- Liberty Community Unit School District 22,991 people
- Payson Community Unit School District 12,664 people
- Warsaw Community Unit School District 3162,425 people
- Griggsville-Perry Community Unit School District 42,163 people
Districts with land in the county; a district can cross county lines. People counts are American Community Survey 2020–2024 5-year estimates. A district boundary doesn’t decide which school a student attends.
Cities, towns and communities, largest first
These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.
- Quincy, Illinois (city)39,109 people
- Camp Point, Illinois (village)1,230 people
- Mendon, Illinois (village)1,167 people
- Payson, Illinois (village)1,100 people
- Ursa, Illinois (village)726 people
- Golden, Illinois (village)693 people
- Clayton, Illinois (village)602 people
- Liberty, Illinois (village)409 people
- Loraine, Illinois (village)341 people
- Lima, Illinois (village)224 people
- Coatsburg, Illinois (village)209 people
- Plainville, Illinois (village)183 people
All 25
- Paloma, Illinois (CDP)161 people
- Burton, Illinois (CDP)149 people
- Kingston, Illinois (CDP)132 people
- Adams, Illinois (CDP)106 people
- Columbus, Illinois (village)106 people
- La Prairie, Illinois (village)48 people
- Marcelline, Illinois (CDP)33 people
- Fowler, Illinois (CDP)32 people
- Meyer, Illinois (CDP)22 people
- Beverly, Illinois (CDP)0 people
- Bloomfield, Illinois (CDP)0 people
- Fall Creek, Illinois (CDP)0 people
- Richfield, Illinois (CDP)0 people
Bordering areas, nearest first
Distances are straight lines between map points.
- Brown County, Illinois24 mi east
- Marion County, Missouri26 mi southwest
- Hancock County, Illinois29 mi north
- Lewis County, Missouri29 mi west
- Pike County, Illinois30 mi southeast
- Schuyler County, Illinois33 mi east
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