Oregon of all places was bombed by the Japanese during the war. A float plane launched from a Japanese submarine conducted two bombing runs near Brookings, Oregon in September 1942. The idea being to start forest fires and perhaps compel the US to pull forces back for West Coast defense. The incendiary bombs fizzled in the rain-soaked Oregon forests and the attacks were kept quiet.
http://en.wikipedia.org/wiki/Lookout_Air_Raids
Outside of Japan's scattershot balloon bombs, they were the only Axis bombing raids on the continental US during the war.