US Post Office is located at 1314 Railroad St, Summerhill, PA. This business specializes in Post Offices. US Post Office is open Mon, 8:05am-4:59pm; Tue, 8:05am-4:59pm; Wed, 8:05am-4:59pm; Thu, 8:05am-4:59pm; Fri, 8:05am-4:59pm; Sat, 8:05am-11:59am; Sun, Closed and accepts American Express, Discover, Mastercard and Visa.