Resident Population in Otero County, CO was 17.99100 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Otero County, CO reached a record high of 24.10000 in January of 1975 and a record low of 17.99100 in January of 2024. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Otero County, CO - last updated from the United States Federal Reserve on April of 2026.