I get this question all the time.  Here’s a list of the all-boys independent schools, ranked, in alphabetical order:

  • Allen-Stevenson School
  • Browning School
  • Buckley School
  • Collegiate School
  • Saint David’s School
  • St. Bernard’s School

For a directory, look at: NYC Private Boys Schools Contact Info.  Note that Saint David’s is a Catholic independent school.

Only Collegiate and Browning go all the way from kindergarten to 12th grade.