
Sumner
- County:
- Lawrence County
- County Seat:
- No
- Area (mi²):
- 1.398
- State:
- Illinois
Sumner is a city located in Lawrence County, Illinois. Sumner has a 2025 population of 2,570. Sumner is currently declining at a rate of -0.5% annually and its population has decreased by -2.47% since the most recent census, which recorded a population of 2,635 in 2020.
The average household income in Sumner is $63,091 with a poverty rate of 33.07%. The median age in Sumner is 37 years: 37.7 years for males, and 32.7 years for females.