Grandview is a city in Jackson County, Missouri, United States. The population was 26,209 at the 2020 census. It is part of the Kansas Ci…Grandview is a city in Jackson County, Missouri, United States. The population was 26,209 at the 2020 census. It is part of the Kansas City metropolitan area. A post office called Grandview has been in operation since 1889. The city was named for the view obtained from the elevated town site.