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Los Angeles has over the years provided the backdrop for all sorts of television shows and movies: Westerns, science fiction, war movies and cops-and-robbers. In recent weeks, a corner of the county has been transformed into something else: the state of Iowa in the midst of a presidential campaign.

The cast and crew of “Veep” have descended upon the San Fernando Valley to film episodes of the final season of the HBO series. Its main character, Selina Meyer, played by Julia Louis-Dreyfus, is making a bid for the presidency; and what road to the White House doesn’t lead through Des Moines? (No spoiler alerts here because — well, we don’t know what happens next season.)

Among the locations: the Underwood Family Farms in Moorpark, which has been tricked up to look like a fair. “They already had a bunch of animals and farm stuff like giant pumpkins, and we added a few rides, as well as games and deep-fried foods on a stick,” said David Mandel, the executive producer of “Veep,” whose lively Instagram feed has been offering a running chronicle of the adventure.

With its scrubby hills and mountains, Los Angeles — particularly the San Fernando Valley and the Santa Monica Mountains — has easily lent itself to shows like “Gunsmoke,” “Bonanza,” “Batman” and “M*A*S*H.” But Iowa?