Urgent Care of Mercer County is conveniently located along Route 33 in Hamilton, just a few miles outside of Trenton. We are open seven days a week with extended hours in order to accommodate unexpected symptoms and busy schedules. Urgent Care of Mercer County is a full-service walk-in clinic specializing in the diagnosis and treatment of a variety of non-emergency related injuries and illnesses from vaccines and sinus pains to cuts and sprains.