Where was The Slaughter Rule filmed?
2002 American film by Alex Smith
The Slaughter Rule (2002) was filmed in Great Falls, 1 place named in its Wikipedia article's Production section, 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 Production section
Wikipedia’s Production section names 1 place. Each links to the sentence that says so.
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Towns & cities
Great Falls
United States
City in and county seat of Cascade County, Montana, United States
“Filming for the movie largely took place in Great Falls, Montana, and a series of small towns in the Great Falls vicinity.” Wikipedia