John T Gilliam List of directors and agents named John T Gilliam. Found 2 results. JOHN T. GILLIAM Registered Address: 4720 68TH AVENUE HYATTSVILLE MD 20784 Appointed in one company. Go To Profile JOHN T. GILLIAM Registered Address: 4720 68TH AVE. HYATTSVILLE MD 20784 Appointed in one company. Go To Profile