Jiann Y Koa List of directors and agents named Jiann Y Koa. Found 2 results. JIANN Y. KOA Registered Address: 7 MONONA COURT ROCKVILLE MD 20855 Appointed in one company. Go To Profile JIANN Y YOA Registered Address: 10430 AUTO PARK DRIVE BETHESDA MD 20187 Appointed in one company. Go To Profile