US Post Office is located at 3219 Dune Dr, Avalon, NJ. This business specializes in Post Offices. US Post Office is open Mon, 9am-5pm; Tue, 9am-5pm; Wed, 9am-5pm; Thu, 9am-5pm; Fri, 9am-5pm; Sat, 9am-1pm; Sun, Closed and accepts American Express, Discover and Visa.