The description of this exhibit from the 1964 Official Guide Book

Cover- 1964 Guidebook

The description of this exhibit from the 1965 Official Guide Book

Cover - 1965 Guidebook

The location of this exhibit on the 1964 Official Souvenir Map

Cover - 1965 Guidebook

U.S. POST OFFICE

A transparent candy factory - two glass-walled buildings connected by a cooling tunnel - enables visitors to watch candy bars being made in an almost completely automated process. The pavilion, called "Chunky Square," also has a playground of 13 abstract sculptures that youngsters may climb on.
Highlights 
The nation's most mechanized mail service is in operation in a purely functional building put up by the Fair, and the public is invited to watch. A multitude of new sorting and handling machines enables the Post Office to deliver twice-a-day, six-day-a-week mail to all Fair exhibitors. A nine-foot high ramp leads visitors through the working area, where they may watch the machines in operation while a recorded narration explains what is going on below. A museum of colorful international mailboxes is on display outside.
* Admission: free. Open daily. 

U.S. POST OFFICE

Visitors climb a ramp to see one of America's most mechanized Post Offices in full operation.

In this highly functional building, advanced sorting and handling machines process mail for twice-a-day delivery to all Fair exhibitors. Visitors hear a recorded explanation of the operations. Colorful mailboxes from many nations are on display outside.

Admission: free. Open daily.


Artist's rendering of the U.S. Post Office

SOURCE: Commercial Transparency by Photo Lab, Inc., Washington, DC

Artist's Rendering

 

The Fair Gets Everything It Needs to Send a Letter

US Post Office 1964

The new United States Post Office building that was dedicated yesterday at the Fair in Flushing Meadow. When mailing to World's Fair, include the ZIP code number, 11380
 
SOURCE: New York Times, courtesy of Bruce Mentone

The Post Office Building circa Summer 2000
US Post Office 2000
Source: Photograph Copyright 2000, Bruce Mentone