Jbsa Ft Sam Houston, TX

ZIP code 78234 is a military ZIP code in northeastern San Antonio, covering Joint Base San Antonio–Fort Sam Houston and nearby facilities. The area includes historic Fort Sam Houston, whose landmark district preserves 19th- and early-20th-century military architecture. Notable sites include the Quadrangle, the Army Medical Department Museum, and Brooke Army Medical Center. The surrounding landscape is shaped by military and medical institutions, with limited civilian development.