About Internal Medicine Associates. Internal Medicine Associates is a group practice with 1 location. ... Internal Medicine Associates Office Locations. Internal Medicine Associates Pa. 3105 Limestone Rd Ste 301 Wilmington, DE 19808 (302) 633-1700. Monday : 8:30 AM - 5:00 PM: Tuesday : 8:30 AM - 5:00 PM: Wednesday : 8:30 AM - 5:00 PM: Thursday ....