48222 zip code is the only floating post office in the U.S.

A Mail Boat Stays Afloat

"...A narrow street dead-ends at the Detroit River, where a black-and-white boat bobs in the water, emblazoned with a Postal Service eagle. This is the mail boat J.W. Westcott II, the only floating ZIP code in the United States. The little boat’s ZIP code, 48222, is reserved for mail addressed to the freighters that ply the Great Lakes ..."   
Source: www.nytimes.com

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