Where was Impostor filmed?
2001 film directed by Gary Fleder
Impostor (2001) was filmed in Running Springs and Coachella Valley, 2 places named in its Wikipedia article, in the United States. Wikidata itself records the shoot only as Arizona, California. 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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Landscapes & nature
Coachella Valley
United States
Valley in southern California, United States
“Other filming locations included the Coachella Valley.” Wikipedia
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Towns & cities
Running Springs
United States
Census-designated place in San Bernardino County, California, United States
Recorded only at country level
Also filmed in Arizona, California, but the exact places are not known, so they are not on the map.
Filming locations that are mapped there: United States