Everton is a city in southeast Dade County, Missouri, United States. The population was 273 at the 2020 census. Everton was platted in 1881…Everton is a city in southeast Dade County, Missouri, United States. The population was 273 at the 2020 census. Everton was platted in 1881. The city was named by railroad officials in honor of a man with the surname Evert or Everett, but the identity of the namesake is unknown to the State Historical Society of Missouri. A post office called Everton has been in operation since 1881.