Oronogo is a city in Jasper County, Missouri, United States. The population was 2,558 at the 2020 census. It is part of the Joplin, Miss…Oronogo is a city in Jasper County, Missouri, United States. The population was 2,558 at the 2020 census. It is part of the Joplin, Missouri Metropolitan Statistical Area. Oronogo was platted in 1856.