I agree that "SAFE" is subjective. But there are other options. If you would really like to know about crime in the area, call the police department. They may be pretty helpful with that kind of information.
Mortgage Broker or Lender, Saint Louis, MO
As a boarding neighbor to Hanley Hills via Ucity. I for one haven't heard any bad news out of the Hanley Hills area. Again, its always best look at relevant crime data for that neighborhood for more of a precise answer to your question. Are you looking to move there?
When it comes to any safety/crime related issues, it's always best to contact the local police department with all your questions, hear all there is to hear firsthand. If unfamiliar with the area(s) do revisit more than once and at different times of day, possibly chat with locals/neighbors. Real estate professionals are prohibited from steering, enticing a buyer to purchase/rent, or not, in specific neighborhoods.