Resident Population in Gwinnett County, GA was 1018.09900 Thous. of Persons in January of 2025, according to the United States Federal Reserve. Historically, Resident Population in Gwinnett County, GA reached a record high of 1018.09900 in January of 2025 and a record low of 72.34900 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Gwinnett County, GA - last updated from the United States Federal Reserve on May of 2026.