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
~7 min read
Encyclopedic overview
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
Excerpted from Wikipedia’s “Johnson County” article, available under the CC BY-SA 4.0 licence.