I noticed today that Mt. Carmel Cemetery (Glendale, Queens, New York), which has taken over supervision of the nearby cemetery Knollwood Park Cemetery(in Ridgewood), has finally put online the information about the Knollwood Park burials.
There are currently over 17,000 burials listed now and I am assuming that this is the current number of burials at the cemetery. You should be forewarned, however, that most of the dates of death, especially the deaths pre-2000, are not included. These dates are simply listed as 1/1/1900, which is the default date for the database. I have no idea why this happened or if it will be fixed in the future.
The Knollwood Park burials are listed as Cemetery Section 5 within Mt. Carmel's website. Sections 1 and 2 are of the main "old" Carmel Cemetery; Section 3 is of the New Carmel Cemetery (down the road), and Section 4 is of the (former) Hungarian Union Fields Cemetery. You can find the burial data for these five sections combined as one on the Mt. Carmel Cemetery site at www.mountcarmelcemetery.com . I imagine if you find a burial for Knollwood Park and would like to know the actual date of death for someone, you can telephone either Knollwood Park or Mt. Carmel; I'm not sure if one or the other or both have that information.