Send Us a Message Marathongroup.com contact form Name First Last Email PhoneMessageEmailThis field is for validation purposes and should be left unchanged. CLAIMS DEPARTMENT 855-6-MARATHON MAILING ADDRESS P.O. BOX 961O’FALLON, IL 62269 CAREERS SEND EMAIL PARTNERS SEND EMAIL Corporate Headquarters 1331 LAMAR ST. SUITE 1075HOUSTON, TX 77010