Where was Silent Night, Bloody Night filmed?
1972 film
Silent Night, Bloody Night (1972) was filmed in Oyster Bay and Old Westbury, 2 places named in its Wikipedia article, in the United States. Wikidata records no filming location for it at all, so the article is the only recorded source. Each place says where its claim comes from.
Places per Wikipedia's article
The Wikipedia article names 2 places. Each links to the sentence that says so.
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Towns & cities
Old Westbury
United States
Village in Nassau County, New York, United States of America
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Towns & cities
Oyster Bay
United States
Town on Long Island, New York, United States
“Co-written by Jeffrey Konvitz, Silent Night, Bloody Night was filmed in November and December 1970 in Oyster Bay, New York.” Wikipedia