US Post Office is located at 101 E Main St, Coldwater, OH. This business specializes in Post Offices. US Post Office is open Mon, 7:25am-4:25pm; Tue, 7:25am-4:25pm; Wed, 7:25am-4:25pm; Thu, 7:25am-4:25pm; Fri, 7:25am-4:25pm; Sat, 7:25am-9:25am; Sun, Closed and accepts American Express, Discover and Visa.