With four million people on an island 13 miles long and 2 miles wide, you would expect that a whole lot of mail moves through Manhattan. Getting all of that mail where it needs to go is a monumental task that relies on the zip code system. Interestingly enough, there are buildings in Manhattan that have their own zip code. The best known building with its own zip code is New York City’s Empire State Building. Erected during the Great Depression and employing up to 3,400 workers, the building stands 1,454 feet tall. When it was constructed in 1931, it was the tallest building in the world. Located in midtown Manhattan at Fifth Avenue and 34th Street, the Empire State Building stands within the geographical boundaries of the city’s 10001 zip code. However, in 1980, the building received its own unique zip code of 10118 to help route deliveries to the many offices that fill the building’s 102 floors. Other buildings with their own zip code include One Penn Plaza (10119), the MetLife Building (10166), 30 Rockefeller Plaza (10112), the Chrysler Building (10174), and the General Motors Building (10153).