Thenon is a commune in the Dordogne department in Aquitaine in southwestern France. Thenon serves as the seat of the canton of the same name.
| Year | Population | Density | Percent of the canton |
|---|---|---|---|
| 1962 | 1,062 | - | - |
| 1968 | 1,096 | - | - |
| 1975 | 1,253 | - | - |
| 1982 | 1,259 | - | - |
| 1990 | 1,339 | - | - |
| 1999 | 1,205 | 46/km² | - |