US Post Office is located at 121 E Commercial St, Lebanon, MO. This business specializes in Post Offices. US Post Office is open Mon, 8am-4:05pm; Tue, 8am-4:05pm; Wed, 8am-4:05pm; Thu, 8am-4:05pm; Fri, 8am-4:05pm; Sat, 9am-1pm; Sun, Closed and accepts American Express, Discover, Mastercard and Visa.