US Post Office is located at 1718 George Warren Dr, Williams, SC. This business specializes in Post Offices. US Post Office is open Mon, 8am-4pm; Tue, 8am-4pm; Wed, 8am-4pm; Thu, 8am-4pm; Fri, 8am-10:25am; Sat, Closed; Sun, Closed and accepts American Express, Discover, Mastercard and Visa.