East Dubuque is a city in Jo Daviess County, Illinois, United States. East Dubuque is located alongside the Mississippi River. Across the river is the city of Dubuque, Iowa. About three miles north of the city is the Illinois - Wisconsin border. East Dubuque was originally known as Dunleith. According to the United States Census Bureau, the city has a total area of 2.1 square miles (5.4km2), of which, 2.1 square miles (5.4km2) of it is land and 0.1 square miles (0.26km2) of it (3.74%) is water.