Mason County
Also known as Mason County, Illinois, Mason County, IL
county in Illinois, United States
Key facts
- Country
- United States
- State
- Illinois
- Named after
- George Mason
- Seat
- Havana
- Largest city
- Havana
- Total
- 563 sq mi (1,460 km )
- Land
- 539 sq mi (1,400 km )
- Water
- 24 sq mi (62 km ) 4.3%
- Estimate 2025
- 12,411
- Density
- 24.3/sq mi (9.37/km )
- Time zone
- UTC−6 ( Central )
- Summer dst
- UTC−5 ( CDT )
- Congressional district
- 15th
~7 min read
Article
Mason County is a county in the U.S. state of Illinois. According to the 2020 census, it had a population of 13,086. Its county seat is Havana. The county is named in honor of George Mason, a member of the Virginia legislature who campaigned for the adoption of the United States Bill of Rights.
History