Where was The Crazies (1973) filmed?

1973 film directed by George A. Romero

The Crazies (1973) was filmed in Pittsburgh, Zelienople and Evans City, 3 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.

See them on the map → Wikipedia Source data