The question is, Is Crabapple GA In Milton or Alpharetta, or both? Well there is now a Map, recently published on the Cities official website, to show what is considered the boarder of the Historic North Fulton area of Crabapple, and here it is.
As you will notice, there are only a handful of Crabpple Neighborhoods in this small area of Crabapple. They include, from North to South clockwise: Six Hills, Kensington Farms, Braeburn, Old Place At Crabapple, Crabapple Crossing, Crabapple Station, Crabapple Crossroads, Parkview, Arbor North, Heritage At Crabapple, Waterside, Parkside At Silos and Oakmont at Crabapple. After looking at the neighborhoods and the Crabapple lines on the above Map, it appears to me that all of these communities are located in the City of Milton.
If you would like to take a peak at what is for sale in the Crabapple area, feel free to visit this link: www.CrabappleMilton.com