US Post Office is located at 7229 Main St, Killduff, IA. This business specializes in Post Offices. US Post Office is open Mon 7:00am-3:30pm, Tue-Thur 7:00am-12:30pm, Fri 7:00am-3:30pm, Sat 7:00am-8:30am and accepts American Express, Discover and Visa.