Recently, I received an electronic missive from L.W.A. member Joan C. She had just seen an article that mentioned the "Smallest Post Office", a 40 square foot structure once on Lilac Road in Valley Center, CA. She grew up right near there and thought it was neat.
The claim gave me pause. I thought that the Smallest Post Office was Ochopee Post Office in Florida. Turns out, the tiny Everglades P.O. is the smallest post office in current operation. The one from California was decommissioned in 1912. The building, all 40 square feet of it, now resides in the Valley Center History Museum.
P.S. The Bridal Veil Post Office is also quite small, but at 140 square feet, it is almost double the size of the one in Ochopee.