Kellyville is a town in Creek County, Oklahoma, United States. The population was 1,019 at the 2020 census. Kellyville was named for James E. Kelly, who established a local trading post in 1892 and opened a post office on November 27, 1893. The St. Louis and Oklahoma City Railroad-- later merged into the St. Louis and San Francisco Railway -- built a li…Kellyville is a town in Creek County, Oklahoma, United States. The population was 1,019 at the 2020 census. Kellyville was named for James E. Kelly, who established a local trading post in 1892 and opened a post office on November 27, 1893. The St. Louis and Oklahoma City Railroad-- later merged into the St. Louis and San Francisco Railway -- built a line through Kellyville in 1898.