I don't know what the source of data Google is using but there are providers of neighborhood data that you can license. Maponics has probably the most complete data set that I know of. You might contact them and see if it fits your requirements.
You can't get the data directly from Google. That dotted line is drawn on the tiles, not passed as data to the browser. -John Coryat -- You received this message because you are subscribed to the Google Groups "Google Maps JavaScript API v3" group. To view this discussion on the web visit https://groups.google.com/d/msg/google-maps-js-api-v3/-/ZpjoqllNSwsJ. To post to this group, send email to google-maps-js-api-v3@googlegroups.com. To unsubscribe from this group, send email to google-maps-js-api-v3+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-maps-js-api-v3?hl=en.