Hamilton County (Illinois) Fairgrounds Location Route 14 West McLeansboroIllinois62859 Next Event Carnival for Children and Adults with Developmental Disabilities in McLeansboro - Wednesday, June 11, 2025 - 10:00 am - 2:00 pm Upcoming Events Carnival for Children and Adults with Developmental Disabilities in McLeansboro - Wednesday, June 11, 2025 - 10:00 am - 2:00 pm