Trewinnion is a hamlet in central Cornwall, United Kingdom. It is situated north of the village of Summercourt about four miles (6.5 km) south-west of Newquay. The settlement consists of a large farmstead and several cottages. Trewinnion was formerly a manor in the ancient parish of St Enoder which mortgaged in the 1850s by the Mohun family.
- Records held by Cornwall County Council.
- Ordnance Survey, 1:25000 'Explorer' map, sheet 106, ISBN 978-0-319-24016-8
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