Union Pacific Railroad--post Offices, High Hill High Hill, MO 63350 Phone : (636) 585-2350 Business Category Railroads Line-Haul Operating Post Offices Railroads Post Office - High Hill 879 Booneslick Rd High Hill, MO 63350 Phone : (636) 585-2350 Post Office - High Hill Business Category Post Offices National Security Recruiting Us Armed Forces Toll-Free           (800) ASK-USPS United States Government--u.s. Postal Service, High Hill High Hill, MO 63350 Phone : (636) 585-2350 United States Government--u.s. Postal Service, High Hill Business Category Government Offices-Federal National Security Recruiting Us Armed Forces Government Offices & Public Schools