Number of cemeteries which contain headstones for John Belushi:

2
After Belushi died of a drug overdose on March 5, 1982, he was buried in an unmarked grave at Abel's Hill Cemetery on Martha's Vineyard. However, there is a large rock at the entrance to the cemetery with the name "BELUSHI" carved into it. Meanwhile, at Elmwood Cemetery in River Grove, Illinois, Belushi's family put up a headstone for Belushi at the family burial plot.
Source: Chicago Sun Times, 2/15/2000