Since I started botting I wanted eevee location but couldn't find it anywhere, then I found this one myself, hope it helps. I guess you know the main reason you farm eevees is Vapereon, basically one of the strongest pokemons atm.
The spot is James J Braddock North Hudson County Park a bit west from New York.
Cords are 40.80062106285213, -74.0018892288208