Otis is a Statutory Town in Washington County, Colorado, United States. The population was 534 at the 2000 census. Otis was established in 1883 as a stop on the Burlington rail line. The post office opened in 1886 and the town was platted in 1887. Otis is located at 40°9′2″N 102°57′45″W / 40.15056°N 102.9625°W / 40.15056; -102.9625 (40.150645, -102.962521).