Dunleith Township is one of 23 townships in Jo Daviess County, Illinois, United States.

As of the 2010 census, its population was 3,820 and it contained 1,713 housing units.

[2] It was formed from Menominee Township on March 2, 1865.

Dunleith Township is in the very northwest corner of Illinois, abutting Wisconsin to the north and Iowa to the west across the Mississippi River.

[2] Dunleith is Townships 28 (part) and 29 North, Range 2 (part) West of the Fourth Principal Meridian.