Head Office & Illinois Basin Field Office
- Address
P.O. Box 838
Lawrenceville, IL 62439 - Phone
618-943-2227 - Fax
618-943-2220
Exploration & Production Operations Office
- Address
24047 Lockport St., Suite 203
Plainfield, IL 60544 - Phone
815-556-0756
Mid-Continent field office
- Address
5518 S. Oil Center Rd.
Great Bend, KS 67530 - Phone
620-792-0527 - Fax
620-792-0537