Ochelata is a town in Washington County, Oklahoma, United States. The population was 424 at the 2010 census, a decline of 14.2 percent from the figure of 494 recorded in 2000. This settlement was founded circa 1898 by Thomas Ellis, who had bought 40 acres from a Cherokee land owner named Jacob Dick. Ellis named the community Otis. It was renamed …Ochelata is a town in Washington County, Oklahoma, United States. The population was 424 at the 2010 census, a decline of 14.2 percent from the figure of 494 recorded in 2000. This settlement was founded circa 1898 by Thomas Ellis, who had bought 40 acres from a Cherokee land owner named Jacob Dick. Ellis named the community Otis. It was renamed Ochelata in November 1899 to honor Cherokee Principal Chief Charles Thompson, whose Cherokee name was Oochalata. The Atchison, Topeka and Santa Fe Railway reached Ochelata in 1899. A post office was established March 23, 1900, and the town of Ochelata was incorporated in 1902.