Swainton is an unincorporated community located within Middle Township in Cape May County, in the U.S. state of New Jersey. U.S. Route 9 and the Garden State Parkway are major roads of Swainton. Avalon is a coastal community directly across from Swainton, connected by Avalon Boulevard. A post office was established in 1896, with Luther Swain as the first postmaster. Swainton is home to Union League National Golf Club—a 27-hole golf course offering an 18,000-square-foot clubhouse.