Toluca is a city in Marshall County, Illinois, United States. The population was 1,339 at the 2000 census. It is part of the Peoria, Illinois Metropolitan Statistical Area.
Toluca is located at 41°0′12″N 89°8′0″W / 41.00333°N 89.133333°W / 41.00333; -89.133333 (41.003368, -89.133244).
According to the United States Census Bureau, the city has a total area of 1.1 square miles (2.7 km²), all of it land.