Half Day, Illinois

Half Day is a former unincorporated town in Lake County, Illinois, in the state's northeastern region.

[3] Half Day was named for Aptakisic, a local Potawatomi chief who allied himself with White settlers during the Black Hawk War.

After his removal to the vicinity of Elmont, Kansas after the 1833 Treaty of Chicago, settlers applied his name first to an inn, then to the unincorporated town.

[4] While Aptakisic was the source of Half Day's name, local legends arose offering folk etymologies for the town.

[4] Another, which circulated in the early twentieth century, stated that a chief named "Hefda," transcribed by a cartographer as "Half Day", was the source.