Treffrin (French pronunciation: [tʁɛfʁɛ̃]; Breton: Trefrin) is a commune in the Côtes-d'Armor department in Brittany in northwestern France.
| Year | Pop. | ±% |
|---|---|---|
| 1962 | 253 | — |
| 1968 | 256 | +1.2% |
| 1975 | 367 | +43.4% |
| 1982 | 550 | +49.9% |
| 1990 | 608 | +10.5% |
| 1999 | 572 | −5.9% |
| 2008 | 550 | −3.8% |
Inhabitants of Treffrin are called treffrinois in French.
| National | |
|---|---|
| Geographic | |
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