Where was On an Island with You filmed?
1948 film by Richard Thorpe
On an Island with You (1948) was filmed in Culver City, Manatee County, Winter Haven, Key Biscayne and Anna Maria Island, 5 places named in its Wikipedia article, in the United States. Wikidata itself records the shoot only as Florida. Each place says where its claim comes from.
Places per Wikipedia's article
The Wikipedia article names 5 places. Each links to the sentence that says so.
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Towns & cities
Culver City
United States
City in Los Angeles County, California, United States
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Towns & cities Key Biscayne
United States
Village in Miami-Dade County, Florida, United States
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Towns & cities
Winter Haven
United States
City in Polk County, Florida, United States
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Landscapes & nature Anna Maria Island
United States
Island in Florida, United States
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Towns & cities
Manatee County
United States
County in Florida, United States
Recorded only at country level
Also filmed in Florida, 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
Never So FewWar film1959- Gold MadnessFilm1923