Besides Zillow's creative-commons licensed neighborhood boundaries shapefiles, what sources of neighborhood boundaries are there? Not just in the US, but all over the world.
Free/open source is ideal, but paid sources could be interesting too.
How to Seek Neighborhood Boundaries Globally
datapolygon
Related Solutions
EarthNetworks
Earth Networks Total Lightning NetworkTM (ENTLN)
"incorporates patent pending systems and methods for the detection of lightning activity to provide unmatched global IC and CG detection efficiency. It is the first integrated in-cloud (IC) lightning and cloud-to-ground (CG) detection network deployed on a global basis capable of detecting long range IC lightning at high efficiencies critical for the advanced prediction of severe weather phenomena such as:"
Tornadoes/cyclones
Heavy rainfall/monsoons
Downburst winds/wind shear
Cloud-to-Ground lightning strikes
'Approximately 600 wideband lightning sensors deployed globally' PDF http://www.earthnetworks.com/Portals/0/pdf/ENTLN%20Global%20Slick_v4.pdf
For administrative boundaries, look at GADM database of Global Administrative Areas Select India, and choose "level 3".
Edit: here's a screen grab of the resulting KML file, looks like it matches the link you provided, but GADM has it for the whole country.
Best Answer
I don't know what the state of mapping with this is, but OpenStreetMap has a
place:neighbourhoodtag (note the British spelling).As the boundaries of neighborhoods are often nebulously defined I think no matter the source you will have to understand that using them for anything more than general display/labeling is going to be tricky.