Resident Population in Carroll County, NH was 52.58000 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Carroll County, NH reached a record high of 52.58000 in January of 2024 and a record low of 18.54800 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Carroll County, NH - last updated from the United States Federal Reserve on April of 2026.