Old Hundred is an unincorporated community and census-designated place (CDP) in Scotland County, North Carolina, United States. As of the 2020 census, Old Hundred had a population of 218. Old Hundred has the lowest per capita income ($5,846) of any CDP in North Carolina.
Old Hundred was originally calculated to be the 100-mile-marker point along the Wilmington, Charlotte and Rutherford Railroad, traveling west of Wilmington. The calculation was inaccurate and later corrected, but the name remained. The longest straight stretch of railroad track in the United States, spanning 78.86 miles, connects Old Hundred and Wilmington.
According to the U.S. Census Bureau, the community has an area of , all of it land. U.S. Route 74 passes through the community.