Mill Spring, NC
Mill Spring is an unincorporated community in Polk County, North Carolina, United States. Mill Spring is located at the junction of North Carolina Highway 9 and North Carolina Highway 108 3.7 miles 6.0 km northeast of Columbus. Mill Spring has a post office with ZIP code 28756. Mill Spring is named after Colonel Ambrose Mills. He founded a saw mill and post office in the community. Source: Wikipedia