Altona (formerly LaPier & Walnut Grove) is a village in Knox County, Illinois, United States.

Altona was originally called La Pier, and under the latter name was laid out in 1834.

[3] According to the 2010 census, Altona has a total area of 1 square mile (2.59 km2), all land.

There were 230 housing units at an average density of 226.3 per square mile (87.4/km2).

22.7% of all households were made up of individuals, and 11.6% had someone living alone who was 65 years of age or older.