Viburnum is a city in Iron County, Missouri, United States. The population was 667 at the 2020 census. The city is located in the New Lead Belt…Viburnum is a city in Iron County, Missouri, United States. The population was 667 at the 2020 census. The city is located in the New Lead Belt. The Mayor of Viburnum is Johnny Setzer. A post office called Viburnum was established in 1907, and remained in operation until 1955. The city was named for the genus Viburnum, commonly known as the black haw and arrowwood.