<p>Just go by the test of whether a post office would deliver there. You can send mail addressed to “Astoria, NY” and it will go to the proper neighborhood in queens. You can address something to Brooklyn Heights. Whatever used to be a distinct village back in the 1800s before it was all incorporated in 1898 probably can be considered its own neighborhood.</p>
<p>Harlem definitely has its own post office and is recognized as an address. Morningside Heights has a “Morningside Station, 10025” post office but I don’t think you could address a letter to Morningside Heights. So I’d say it’s part of harlem.</p>
<p>White harlem, sure. MH is basically Columbia’s euphemism for “please just don’t call it harlem, it drives down our property values”.<br>
But I think once you get north of 96th st, it’s all Harlem until you hit Washington Heights.</p>