Resident Population in Johnston County, NC was 249.79400 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Johnston County, NC reached a record high of 249.79400 in January of 2024 and a record low of 61.73700 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Johnston County, NC - last updated from the United States Federal Reserve on April of 2026.