Kilbourne is a village located in Mason County, in the state of Illinois (IL), United States. Nestled in the East North Central division of the Midwest region, it covers an area of 1.1 square miles (3.0 km²) and sits at an elevation of 500 ft. With a population of approximately 375 residents, Kilbourne offers a peaceful, rural atmosphere.
The town's population is composed of about 51.2% males and 48.8% females, and it has a population density of 353.77 people per square mile (136.59/km²). Kilbourne lies at a latitude of 40.15 and a longitude of -90.01, operating in the UTC-6.
Locals reflect a blend of American ancestry, with roots primarily in United States (4.5%), followed by English (18.9%), German (17.6%), and Scotch-Irish (0%) heritage. The town is identified by the ZIP code 62655.