US Post Office is located at 16 Main St, Andover, NY. This business specializes in Post Offices. US Post Office is open Mon, 7am-1:05pm; Tue, 7am-1:05pm; Wed, 7am-1:05pm; Thu, 7am-1:05pm; Fri, 7am-1:05pm; Sat, 7:05am-11am; Sun, Closed and accepts American Express, Discover, Mastercard and Visa.