Wenona is a city in Marshall and LaSalle counties in the U.S. state of Illinois. The population was 1,065 at the 2000 census.
The Marshall County portion of Wenona is part of the Peoria Metropolitan Statistical Area, while the small portion that lies in LaSalle County is part of the Ottawa–Streator Micropolitan Statistical Area.
Wenona is located at 41°3′11″N 89°3′12″W / 41.05306°N 89.05333°W / 41.05306; -89.05333 (41.053080, -89.053415). Most of the city lies in Marshall County, although a small portion extends into southern LaSalle County. In the 2000 census, all of Wenona's 1,065 residents lived in Marshall County. According to 2006 population estimates, 1,049 of the city's 1,058 residents (99.1%) lived in Marshall County and 9 (0.9%) lived in LaSalle County.