A total of approximately 23,000 people live on Naval Station Great Lakes in Illinois. According to the installation datasheet available through the Department of Defense search tool, this number comprises 4,000 active duty personnel and their dependents, 14,000 students and recruits, 3,000 civilian employees of the government and 2,000 contractors.
As of the last round of Base Realignment and Closures, the population of Naval Station Great Lakes was reduced by 2,000, a number comprising both military and civilian personnel.
Naval Station Great Lakes is the United States Navy's most important center for training recruits and the biggest military installation of any kind in Illinois. Since the First World War, it has trained more than 2 million recruits.