Where was The Dunwich Horror filmed?
1970 film by Daniel Haller
The Dunwich Horror (1970) was filmed in University of Southern California, Mendocino County, Mendocino and Little River, 4 places named in its Wikipedia article, in the United States. Wikidata itself records the shoot only as California. Each place says where its claim comes from.
Places per Wikipedia's article
The Wikipedia article names 4 places. Each links to the sentence that says so.
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Landmarks & buildings
University of Southern California
United States
Private university in Los Angeles, California, United States
“The sequences set at Arkham College were filmed in the philosophy department at the University of Southern California.” Wikipedia
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Towns & cities
Mendocino
United States
Unincorporated community in Mendocino County, California, United States
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Towns & cities
Mendocino County
United States
County in northwestern California, United States
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Towns & cities
Little River
United States
Census-designated place in Mendocino County, California, United States
Recorded only at country level
Also filmed in California, but the exact places are not known, so they are not on the map.
Filming locations that are mapped there: United States
Also shot in these places
The RoommateHorror film2011