Whiteside County
Also known as Whiteside County, Illinois, Whiteside County, IL
county in Illinois, United States
Key facts
- Country
- United States
- State
- Illinois
- Named after
- Samuel Whiteside
- Seat
- Morrison
- Largest city
- Sterling
- Total
- 697 sq mi (1,810 km )
- Land
- 684 sq mi (1,770 km )
- Water
- 12 sq mi (31 km ) 1.8%
- Estimate 2025
- 54,121
- Density
- 81.4/sq mi (31.4/km )
- Time zone
- UTC−6 ( Central )
- Summer dst
- UTC−5 ( CDT )
- Congressional district
~9 min read
Article
Whiteside County is a county located in the U.S. state of Illinois. According to the 2020 census, it had a population of 55,691. Its county seat is Morrison. The county is bounded on the west by the Mississippi River. Whiteside County comprises the Sterling, IL Micropolitan Statistical Area, which is also included in the Dixon-Sterling, IL Combined Statistical Area. U.S. President Ronald Reagan was born in 1911 in the Whiteside County community of Tampico.
History