Why Wasn't Hiroshima Evacuated?
However, the Countryside Was Sufficiently Lacking of Food and It Takes a Lot of Logistics and Personnel to Oversee the Evacuation in the Fashionable Manner. So...
However, the countryside was sufficiently lacking of food and it takes a lot of logistics and personnel to oversee the evacuation in the fashionable manner. So either the Japanese civilians stayed in cities or were forced to stay in the cities in order to support the war effort.
Did civilians evacuate Hiroshima?
Overall, 8.5 million Japanese civilians were displaced as a result of the American raids, including 120,000 of Hiroshima's population of 365,000 who evacuated the city before the atomic bomb attack on it in August 1945.
Did the US warn Hiroshima before bombing?
In August 1945, leaflets were dropped on several Japanese cities (including, supposedly, Hiroshima and Nagasaki). The first round, known as the "LeMay leaflets," were distributed before the bombing of Hiroshima.