United States Navy
The US Navy received delivery of the PB4Y-2s from March 1944 to October 1945. The United States Navy used 977 of the Privateers.
Royal Air Force
The Royal Air Force received 27 PB4Ys in 1945 and called them the Liberator C.IX.
Post World War II
The Privateers remained in service with the United States Navy into the 1950s. In 1951 they were designated the P4Y.