Earlville is a city in LaSalle County, Illinois, United States. The population was 1,613 at the 2020 census, down from 1,701 at the 2010 census. The city is part of the Ottawa, IL Micropolitan Statistical Area.

LaSalle County is located within the Fox Valley and Illinois River Valley regions of the U.S. state of Illinois. As of the 2020 Census, it had a population of 109,658. Its county seat and largest city is Ottawa. LaSalle County is part of the Ottawa, IL Micropolitan Statistical Area of Northern Illinois.