New York City - Brooklyn, Urban Center, Diverse: The most populous borough of New York, Brooklyn occupies 81 square miles (210 square km) to the east of Manhattan on the western fringe of Long Island.
USPS is far from perfect. There are plenty of legit addresses that USPS doesn't recognize. College dorms, new homes or developments, old houses that have been converted to apartments, rural areas, etc. Often when USPS says they don't recognize an address, I put it into Google and come up with a photo of the house or apartment. In that case, I ship.
Why does Etsy allow buyers to put in addresses USPS doesn't recognize
Unfortunately, I have not been able to find a USPS Web site which states this clearly, and so for the moment will refer to this Web page by another source (which has links to USPS Web pages which are no longer active ).
@FrameTowne Did you choose USPS retail rates in one shop and commercial rates in the other shop? That would explain the difference. The $13.98 also sounds like it might be Flat Rate or Regional Rate shipping, rather than Priority by weight. In that case, it could be that your Package Preferences are different in the shops.
Brooklyn is the most populous of the five boroughs of New York City, coextensive with Kings County, in the U.S. state of New York. Located at the westernmost end of Long Island and formerly an independent city, Brooklyn shares a land border with the borough and county of Queens.
Brooklyn-based publications include the Brooklyn Eagle newspaper, first published in 1841; Brooklyn Magazine; and the influential, mostly music blog Brooklyn Vegan.