Question: What was the number of Japanese citizens that were killed during the Battle of Midway?
About the article "Battle of Midway", section "Japanese casualties".

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The Battle of the Aleutian Islands was the last battle between sovereign nations to be fought on American soil.
As part of a diversionary plan for the Battle of Midway, the Japanese took control of two of the Aleutian Islands.
Their hope was that strong American naval forces would be drawn away from Midway, enabling a Japanese victory.
Because their ciphers were broken, the American forces only drove the Japanese out after Midway. 
Lloyd Thomas (March 10, 1912 – June 4, 1942) was an aviator in United States Navy who was killed in action in World War II during the Battle of Midway while attacking an Imperial Japanese Navy aircraft carrier. 
"Ensign Brannon" was killed in action 4 June 1942 during the Battle of Midway.
He was awarded a Navy Cross posthumously for his extraordinary heroism in pressing home an attack against a Japanese carrier.
The official Navy citation: The Navy Cross is presented to Charles E. Brannon (0-105955), Ensign, U.S. Navy (Reserve), for extraordinary heroism and distinguished service beyond the call of duty as a Pilot of Torpedo Squadron EIGHT (VT-8) embarked from Naval Air Station Midway during the "Air Battle of Midway", against enemy Japanese forces on 4 and 5 June 1942.
In the first attack against an enemy carrier of the Japanese invasion fleet, Ensign Brannon pressed home his attack in the face of withering fire from enemy Japanese fighters and anti-aircraft forces.
Because of events attendant upon the Battle of Midway, there can be no doubt that he gallantly gave up his life in the service of his country.
His courage and utter disregard for his own personal safety were in keeping with the highest traditions of the United States Naval Service.  
The location of Midway in the Pacific became important to the military.
Midway was a convenient refueling stop on transpacific flights, and was also an important stop for Navy ships.
Beginning in 1940, as tensions with the Japanese were rising, Midway was deemed second only to Pearl Harbor in importance to protecting the U.S. west coast.
Airstrips, gun emplacements and a seaplane base quickly materialized on the tiny atoll.
The channel was widened, and Naval Air Station Midway was completed.
Architect Albert Kahn designed the Officer's quarters, the mall and several other hangars and buildings.
Midway was also an important submarine base.
Midway's importance to the U.S. was brought into focus on December 7, 1941 with the Japanese attack on Pearl Harbor.
Midway was attacked for the first time on December 7, 1941, and the Japanese force was successfully repulsed in the first American victory of the war.
A Japanese submarine bombarded Midway on February 10, 1942.
Four months later, on June 4, 1942, a naval battle near Midway resulted in the U.S. Navy exacting a devastating defeat of the Japanese Navy.
Four Japanese fleet aircraft carriers, the , , and , were sunk, along with the loss of hundreds of Japanese aircraft, losses that the Japanese would never be able to replace.
The U.S. lost the aircraft carrier , along with a number of its carrier- and land-based aircraft that were either shot down by Japanese forces or bombed on the ground at the airfields.
The Battle of Midway was, by most accounts, the beginning of the end of the Japanese Navy's control of the Pacific Ocean. 
Promoted to lieutenant (junior grade) 1 November 1941, he was killed in action during the Battle of Midway, June 1942.
For his "extraordinary heroism" in pressing home his attack on Japanese naval units during that battle, despite "tremendous antiaircraft fire and overwhelming fighter opposition", Lieutenant (junior grade) "Suesens" was awarded the Navy Cross posthumously.