Where was Doc Martin filmed?
British television medical comedy drama
Doc Martin (2004–) was filmed in Port Isaac and Fern Cottage, 2 places named in its Wikipedia article's Locations section, in the United Kingdom. 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 Locations section
Wikipedia’s Locations section names 2 places. Each links to the sentence that says so.
Places whose own article says it was shot there
1 place says on its own Wikipedia page that this series was shot there. Not on the map: the quote is linked so you can check it.
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Towns & cities
Port Isaac
England
Fishing village in Cornwall, England, UK
“From 2004 to 2022, the village served as the backdrop to the ITV television series Doc Martin.” Wikipedia
Recorded only at country level
Its Wikipedia article also says it was filmed in Finistère, without naming a place, so it is not on the map.