For the opening ceremony, the 1934 Postmaster, E. F. Heisser extended a general invitation for visitors to inspect the structure, with music provided by the Glendale Letter Carriers' band and postal employees acting as guides.

[3] As of 1988 it includes a small museum of items from post offices consolidated into Glendale Main.

It serves the communities of Glendale (including Verdugo City), Altadena, Arcadia, Duarte, La Cañada Flintridge, Monrovia, Montrose, Pasadena, Sierra Madre, and South Pasadena, as well as the Los Angeles neighborhood of Sunland-Tujunga.

Prior to 2014 the local post offices in those communities offered passport services.

[7] Media related to Glendale Main Post Office at Wikimedia Commons