You are so close that you don't deserve the correct answer. :D
Homepage of the Dead is footnoted for the Evans City Cemetery location. Alan Jones' book is footnoted for the rubbish location info.
"Alan Jones, however, mistakenly cites the Allegheny Cemetery on Butler Street in Pittsburgh as the filming location. Alan Jones, The Rough Guide to Horror Movies (New York: Rough Guides, 2005), p. 118, ISBN 1-84353-521-1"