Resident Population in Yuma County, CO was 9.86200 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Yuma County, CO reached a record high of 10.19100 in January of 2014 and a record low of 8.30000 in January of 1973. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Yuma County, CO - last updated from the United States Federal Reserve on May of 2024.