US Post Office is located at 69 Route 6A, Sandwich, MA. This business specializes in Post Offices. US Post Office is open Mon, 8:05am-5pm; Tue, 8:05am-5pm; Wed, 8:05am-5pm; Thu, 8:05am-5pm; Fri, 8:05am-5pm; Sat, 8:05am-12:05am; Sun, Closed and accepts American Express, Discover and Visa.