Mérillac (French pronunciation: [meʁijak]; Breton: Merelieg) is a commune in the Côtes-d'Armor department of Brittany in northwestern France.
The Meu forms part of the commune's southern border.
The Rance forms part of the commune's western border, flows east-southeast through the middle of the commune, then forms most of its southeastern border.
| Year | Pop. | ±% |
|---|---|---|
| 1962 | 329 | — |
| 1968 | 385 | +17.0% |
| 1975 | 341 | −11.4% |
| 1982 | 337 | −1.2% |
| 1990 | 267 | −20.8% |
| 1999 | 241 | −9.7% |
| 2008 | 233 | −3.3% |
Inhabitants of Mérillac are called mérillaciens in French.
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