Ellington is a city in Reynolds County, Missouri, United States. The population was 790 at the 2020 census. In 1925, the infamous Tri-St…Ellington is a city in Reynolds County, Missouri, United States. The population was 790 at the 2020 census. In 1925, the infamous Tri-State Tornado began just northwest of Ellington. Ellington, formerly known as Barnesville, was renamed in 1856 for Sina Huff Ellington, who permitted a railroad line to be extended through her family's farmland. An early variant name was "Logan's Creek". A post office called Logan's Creek was established in 1845, and the name was changed to Ellington in 1895.