- Eldorado Headquarters
- US Highway 45
- P. O. Box 120
- Eldorado, IL 62930
- 618.273.7717
- 618.273.9936 (Fax)
- Centralia Facility
- 609 Airport Road
- P. O. Box 1205
- Centralia, IL 62801
- 618.533.1680
- 618.533.5846 (Fax)
- Accounts Payable Invoices & AR/Remittance:
- P. O. Box 1015
- Edwardsville, IL 62025