Johnston is a town in Providence County, Rhode Island, United States. The population was 29,568 at the 2020 census. Johnston is the site of the Clemence Irons House, a stone-ender museum, and th…Johnston is a town in Providence County, Rhode Island, United States. The population was 29,568 at the 2020 census. Johnston is the site of the Clemence Irons House, a stone-ender museum, and the only landfill in Rhode Island. Incorporated on March 6, 1759, Johnston was named for the colonial attorney general, Augustus Johnston.
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