Diamond is a city in north central Newton County, Missouri, United States, located southeast of Joplin. The population was 831 at the 2020 cens…Diamond is a city in north central Newton County, Missouri, United States, located southeast of Joplin. The population was 831 at the 2020 census. It is part of the Joplin, Missouri, Metropolitan Statistical Area. Diamond is primarily renowned as the birthplace of George Washington Carver.
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