Mark is a village in Putnam County, Illinois, United States. The population was 491 at the 2000 census. It is part of the Ottawa–Streator Micropolitan Statistical Area.
Mark is located at 41°15′56″N 89°14′55″W / 41.265594°N 89.248521°W / 41.265594; -89.248521.
According to the United States Census Bureau, the village has a total area of 0.8 square miles (2.1 km²), all of it land.