I haven't been able to find an online open source of US neighborhoods with their corresponding zip codes. I am particularly looking for New York and Los Angeles.
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1Please define US neighborhoods. – user4293 May 12 '17 at 7:35
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I think that's part of the problem, so for example in New York: Upper East Side, Upper West Side, Midtown, Lower East Side, ... – jeangelj May 12 '17 at 20:00
You can use/combine Code for America's Click That 'hood with Zillow Neighborhood Boundary Shapefiles to get some, if not all of that data. Data is here:
Click That 'hood Data Directory
California Neighborhood Boundaries
New York Neighborhood Boundaries