We can help you with your concerns. You can learn from us. Jacksonville Jacksonville is famous for Lejeune Memorial Gardens in Onslow County, North Carolina. Jacksonville is located in Onslow County in the southeastern part of the state. Home to Marine Corps Base Camp Lejeune and Marine Corps Air Station New River, Jacksonville is known as a major city in the Jacksonville metropolitan area. Jacksonville is characterized by the following. Military Presence: Jacksonville has strong ties to the military due to the location of Marine Corps Base Camp Lejeune, one of the largest Marine Corps bases in the world. With ...