Open year round, 24 hours a day. Assateague Island Visitor Center NPS photo. March - November: Open 7 days/week. January-February: Open Thursday-Monday. 9:00 am - 5:00 pm. Closed on Thanksgiving and Christmas days. Phone: (410) 641-1441 press #1. Location: The Assateague Island Visitor Center is located in the Maryland District of Assateague Island on the southern side of Route 611, before the Verrazzano Bridge entrance into the park. The GPS address is 11800 Marsh View Lane, Berlin, Maryland 21811.