Blackhawk Propane is a family-owned, locally operated supplier of propane for home, farm and commercial customers throughout the Wisconsin-Illinois stateline area. Contact Us Blackhawk Propane Company 1000 Doner Drive P.O. Box 141 South Beloit, Illinois 61080 815-389-3522 or toll-free 1-800-371-3522 Fax: 815-389-2719 Zeek2314@aol.com