It two years, but I'm proud to announce that I've visited and documented [photographed] all 74 active postal facilities in Queens, NY, which includes the post offices of Long Island City, Jamaica, Flushing, and Far Rockaway. (And one branch -- Glen Oaks -- of Floral Park, Nassau County.)
There are 63 active offices (4 main offices and 58 stations, plus Glen Oaks), though I've visited 64 -- consider that La Guardia Airport's P.O. was discontinued; 7 CPUs (though I've visited 8, if you include the former site of the Broad Channel CPU); 3 annexes; and the Queens Processing & Distribution Facility (P&DF).
The final office, which I visited this afternoon, was Long Island City's Sunnyside Station:
Like all post offices should (but which few in urban areas do), the station had a beautiful four-bar cancel. Furthermore, "Station" and the state were fully written out; no abbreviations! (For security reasons I have never, and will never, publish scans of any postmarks from my collection here.)