Nitro is a city in Kanawha and Putnam counties in the U.S. state of West Virginia, along the Kanawha River. The population was 7,178 at the 2010 census. Nitro is a part of the Huntington-Ashland, WV-KY-OH, Metropolitan Statistical Area (MSA). As of the 2010 census, the MSA had a population of 287,702. New definitions from February 28, 2013 placed the population at 363,000.

Nitro was incorporated in 1932 by Circuit Court.

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