U S Government--post Office, Bald Knob Bald Knob, AR 72010 Phone : (501) 724-3259 Business Category Post Offices Government Offices & Public Schools Union Pacific Railroad--post Offices, Bald Knob Bald Knob, AR 72010 Phone : (501) 724-3259 Business Category Railroads Line-Haul Operating Post Offices Railroads Post Office - Bald Knob 100 N Main St Bald Knob, AR 72010 Phone : (501) 724-3259 Business Category Post Offices Toll-Free           (800) ASK-USPS