File:Johnson_County_Courthouse_in_Vienna.jpg · Wikimedia Commons · See Wikimedia Commons
Johnson County
Sign in to saveAlso known as Johnson County, Illinois, Johnson County, IL
county in Illinois, United States
Key facts
- Country
- United States
- State
- Illinois
- Named after
- Richard Mentor Johnson
- Seat
- Vienna
- Largest city
- Vienna
- Total
- 349 sq mi (900 km )
- Land
- 344 sq mi (890 km )
- Water
- 4.9 sq mi (13 km ) 1.4%
- Estimate 2025
- 13,363
- Density
- 38.7/sq mi (14.9/km )
- Time zone
- UTC−6 ( Central )
- Summer dst
- UTC−5 ( CDT )
- Congressional district
- 12th
via Wikipedia infobox
Wikidata facts
- Population
- 13308
- Area
- 904
- Image
- Johnson County Courthouse in Vienna.jpg
- Households
- 4174
Show 5 more facts
- Commons category
- Johnson County, Illinois
- water as percent of area
- 1.4
- native label
- Johnson County
- inception
- 1812-00-00
- per capita income
- 23548
Sources (8)
via Wikidata · CC0
~7 min read
Article
Johnson County is a county in the U.S. state of Illinois. According to the 2020 census, it has a population of 13,308. Its county seat is Vienna. It is located in the southern portion of Illinois known locally as "Little Egypt".
History
Gallery (8)
On the map
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list of municipalities in Illinois
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