Resident Population in Delta County, CO was 32.21500 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Delta County, CO reached a record high of 32.21500 in January of 2024 and a record low of 15.28600 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Delta County, CO - last updated from the United States Federal Reserve on April of 2026.