Yes. In August of 1942 a Yokosuka E-14Y capatulted from the Japanese submarine I-25 from off Cape Blanco, Oregon. The plane flew inland about 50 miles and dropped two firebombs over the Oregon Forest. It encountered no resistance and returned safely to the submarine. After replenishing, a second firebombing mission was flown. Manning the E-14Y were Warrant Flying Officer Fujita Nobuo and Petty Officer Okuda Shoji. There was no major damage from the two attacks ever recorded. A picture of the E-14Y with specifications can be found at: www.aviationtrivia.homestead.com/E14Y.html

A portion of the California coast not far from Santa Barbara was also shelled by a Japanese submarine. I don't remember all of the details, but it is a story that I grew up hearing there in Santa Barbara. Additionally, the Japanese also experimented with the use of unmanned balloons to carry fire bombs here using the prevailing winds. Most of the balloons didn't make it this far, but a few did set off forest fires in the Pacific Northwest. At the government's request, the press of the time didn't report the cause of these fires so as to not let the Japanese know about the success of the experiment. Because they didn't know that they had succeeded, they didn't try it again. Despite what drublic wrote, there was also a fairly significant battle that took place on U.S. soil other than Pearl Harbor. True this one didn't occur on the mainland and at the time the site of the battle was just a territory rather than a state, but the Japanese also attacked and took control of two of the Aleutian Islands. We had to send in an invasion force to take them back in what turned out to be a fiercer than expected battle.

There were three attacks by the japanese against the USA proper in WWII----of these two were submarine shellings, and one was an aerial bombing On 2/23/42, a japanese sub surfaced off the coast of Santa Barbra (Goleta) and also San Diego and shelled certain areas of the cities---oil refineries----the shore batteries that could NOT have been seen from the ocean, but would have had to specifically been scouted and reported to the enemy, had been removed the previous day. It was the only points on the coast in which an enemy could surface and attack without being shot at by coastal defenses. The next attacks came in March near the Astoria area of Oregon when another Japanese sub surfaced and using indirect fire was able to accurately shell inland shore batteries. The import of this--once again, these batteries were emplaced after the start of the war and there was no way to see them from the ocean. And this was the only blind spot in the coastal defenses. Given that there were large air patrols, it wasn't possible for japanese observers to scout the location during the day. Additionally, the coastal defenses were emplaced after the start of hostilities in February 1942. They were indirect fire weapons which meant they were not directly on the coast, but several miles from the coast. The fact that the japanese put their first rounds on target meant that someone scouted them out. Finally, in late spring 1942 ship based japanese planes attacked Brookings/Mt. Emily oregon in an attempt to start forest fires. Thess three attacks, combined with radio interceptions eminating from coastal areas along california where there were high concentrations of japanese living resulted in the necessary forced relocation of japanese away from teh coast---despite having asked these people to voluntarily relocate in January/Feb 1942....