The U.S. Post Office In Carrboro The U.S. Post office in Carrboro is located on the corner of Main and James Streets. The entrance is off of James St. It is also accessible of of Highway 54 West. Veer to the right after the light at Carrboro Plaza. The phone number is 968-4573. The U. S. Postal Service now has an 800 number which is 800-275-8777. Home | Overview | About Us | Ads | Art | Businesses | Carrboro and Area Stuff | Carrboro Map | Downtown Carrboro Map | Events | Prices | Restaurants | UniqueOrn Enterprises