Trevallyn may refer to:
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Trevallyn, Gauteng, South Africa
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Trevallyn, Tasmania
Trevallyn is a residential locality in the local government areas (LGAs) of Launceston (25%) and West Tamar (75%) in the Launceston LGA region of Tasmania. The locality is about west of the town of Launceston. The 2016 census recorded a po ...
, Australia
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