Found this today. A Dratini nest in NYC, I was able to farm 8 Dratinies and 2 Dragonaires in 1.5 hours. All within walking distance of each other. This is post patch 1.11, where Niantic pretty much deleted all Dratini nests. Get them while you can. Have fun!
Coords:
(40.766456, -73.999904)
Coords:
(40.766456, -73.999904)