I have done a lot of Vandermark/Van Dermark/Vandemark research for my mothers side of the family and use the same book as you. Howeve Wilhelmus isn't on our direct linage. That said....
Very good question. I looked several places and found numerous entries for his death in 1835, but none show where. His wife Rachael Tervilliger died in Hurley, Ulster, NY. They had a son Wilhelmus (1773-1855) buried in Marbletown, Ulster, NY.
Best guess would be Ulster county, NY. However, that is just a guess. Checked Findagrave with no results, might want to look on Billiongraves.
Bob