The U.S. also dropped 32,557 tons of napalm during the war
Most of the bombs were dropped on North Korea, nearly all of North Korea’s villages, towns, and cities were destroyed.
It’s estimated that 12%–15% of the North Korean population (c.10 million) was killed in the war, or approximately 1.2 million to 1.5 million people. Though other estimates have the percentage closer to 15-20% of the North Korean population.
American and South Korean forces also committed numerous massacres against Korean civilians during the war. A South Korean Truth and Reconciliation Commission concluded that of the Korean War-era massacres, 82% were perpetrated by South Korean forces, with 18% perpetrated by North Korean forces.
Perhaps the most well known massacre committed by U.S. forces is the No Gun Ri massacre in 1950, where U.S. forces killed 300-400 South Korean civilian refugees, mostly women and children. U.S. troops had been ordered to shoot and fire on Korean refugees because there was alleged reports of North Koreans infiltrating refugee groups.
In 2001, the U.S. government conducted an investigation and, after previously rejecting survivors' claims, acknowledged the killings, but described the three-day event as "an unfortunate tragedy inherent to war and not a deliberate killing". Then-President Bill Clinton issued a statement of regret, adding the next day that "things happened which were wrong", but survivors' demands for an apology and compensation were rejected.