At the end of World War II, a total of 78,750 Americans were listed as Missing In Action (MIA)
with roughly half in Pacific. During the Korean War, over 8,000 Americans were listed as Missing In Action.
The recovery and identification America's MIAs began during the war by American and Allied forces. Postwar, the MIA search and identification was tasked to the American Graves Registration Service (AGRS). Today, the Department of Defense (DoD) agency responsible for MIA recovery and identification is the Defense POW/MIA Accounting Agency (DPAA). Every year, new discoveries and reports are
made about remains and wreckage that often lead to sites being discovered and MIA cases resolved.
Today, the number of Americans that are Missing In Action from World War II and the Korean War is constantly being revised, as individuals are officially accounted for. According to the Department of Defense (DoD) as of November 6, 2015 there were 73,515 Americans listed as Missing In Action (MIA) from World War II (including 48,103 WWII dead in the Pacific Theatre). There are 7,832 Americans listed as Missing In Action (MIA) from the Korean War [Source: DPAA - Past Conflicts].
Due to continuing accounting efforts by the DoD, the number of Missing In Action (MIA) is reduced each year. As of May 29, 2017 there were 73,057 from World War II and 7,747 from the Korean War. Previously, as of March 2009, there were 74,791 MIAs from World War II and 8,050 MIAs from the Korean War. [Source DoD March 2009]. As of September 9, 2014 there were 73,536 MIAs from World War II and 7,880 from the Korean War.
CSPAN "House Armed Service Hearing on POW/MIA recovery and accounting" April 2, 2009