J.W. Westcott II. Photo via OldShips


J.W. Westcott II is a mail delivery boat that operates out of Detroit, Michigan, delivering mail to Great Lakes vessels that are underway on the Detroit River. The mail is delivered using a “mail-by-pail” system, as it has done since the first mid-river mail delivery in 1895.

J. W. Westcott II. Photo by Copysan (CC 4.0)


Correspondence and packages bound for ships crews can be delivered to them via J.W. Westcott II by addressing them to:

Vessel Name,
Marine Post Office,
Detroit, Michigan, 48222

The US postal zip code 48222 is exclusive to the floating post office and its ship addressees.



J.W. Westcott II is 45 feet in length and is powered by a single screw 305 horsepower marine diesel engine. In contract with the USPS through 2021, the mail-boat delivers all mail free of charge, courtesy of the US Postal Service.

The New York Times recently published a beautiful editorial about the J.W. Westcott II and her unique service. be sure to read it here…

Hat tip to WHC Steering Committee member Chris Berg – Thanks Chris for the link to this amazing story.


posted by Mai Armstrong for the Working Harbor Committee