Meredosia is a village in Morgan County, Illinois, United States. The population was 1,041 at the 2000 census. It is part of the Jacksonville Micropolitan Statistical Area.
Meredosia is located at 39°49′48″N 90°33′30″W / 39.83°N 90.55833°W / 39.83; -90.55833 (39.829947, -90.558426).
According to the United States Census Bureau, the village has a total area of 1.0 square miles (2.6 km²), of which, 0.9 square miles (2.4 km²) of it is land and 0.1 square miles (0.2 km²) of it (8.00%) is water.