Neighborhoods don't get the same official boundaries as cities, counties, states, and countries. So how do we know where one neighborhood ends and another begins?

Ben Yakas shares news of a made by "meticulous Redditors" to shed some light on the subject of New York City neighborhoods.
The map responds to a severe lack of authoritative neighborhood mapping in the country's most populous city, according to Takas: "No neighborhoods in NYC have any official borders recognized by city or state agencies….But when we're actually out in the city and trying to figure out whether we're eating at a place in DUMBO or Vinegar Hill, it feels somewhat deflating to have to rely on arbitrary real estate demarcations or our digital overlords over at Google Maps to define those boundaries for us."
The article includes a few more fun mapping projects focused on New York City, as well as this video that makes light of a lack of authority on neighborhoods in New York City.
FULL STORY: Interactive Map: How Well Do You Know NYC Neighborhood Boundaries?

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City of Albany
UCLA Lewis Center for Regional Policy Studies
Mpact (formerly Rail~Volution)
Chaddick Institute at DePaul University
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Great Falls Development Authority, Inc.
HUDs Office of Policy Development and Research