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Adding an Oxford comma after Scotland would actually increase the ambiguity! The normal format for a city/place pairing like that is to have the larger place set off with commas on both sides. The lack of a comma subtly (too subtly) indicates Scotland is not paired with Paris.
Didn't know there was a Paris in Scotland!
(Yes this is a pro-Oxford comma tweet, come at me @CopyCurmudgeon)pic.twitter.com/KLSDiWRm8u
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However, as is pretty much always the case, if the clarity of a sentence rests on a single comma, you probably need to rephrase. “In places like Scotland, Paris and Tbilisi, Georgia” works much better, with or without an Oxford comma.
End of conversation
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There's a Paris, Ontario, Canada. (Also London, ON and Brussels, ON.)
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