Beardstown is a city in Cass County, Illinois, United States. The population was 6,123 at the 2010 census. The public schools are in Beardstown Community Unit School District 15.
Beardstown is located at 40°0′44″N 90°25′43″W / 40.01222°N 90.42861°W / 40.01222; -90.42861 (40.012189, -90.428711). Beardstown is located on the Illinois River.
According to the United States Census Bureau, the city has a total area of 3.5 square miles (9.0 km²), of which, 3.4 square miles (8.8 km²) of it is land and 0.1 square miles (0.2 km²) of it (1.73%) is water.