Altona (formerly LaPier & Walnut Grove) is a village in Knox County, Illinois, United States. The population was 570 at the 2000 census. It is part of the Galesburg Micropolitan Statistical Area.
Altona is located at 41°6′48″N 90°9′53″W / 41.11333°N 90.16472°W / 41.11333; -90.16472 (41.113472, -90.164613).
According to the United States Census Bureau, the village has a total area of 1.0 square miles (2.6 km²), all of it land.