McChord AFB, WA

ZIP code 98438 encompasses Joint Base Lewis-McChord (JBLM), one of the largest military installations in the United States. Located near Tacoma, Washington, this base is home to the U.S. Army's I Corps, the 62nd Airlift Wing, and the Western Air Defense Sector. JBLM houses various facilities and resources to support military operations and personnel, including barracks, training grounds, and administrative offices.