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| Thelonne | |
|---|---|
| The church in Thelonne | |
| Coordinates: 49°39′08″N4°56′40″E / 49.6522°N 4.9444°E | |
| Country | France | 
| Region | Grand Est | 
| Department | Ardennes | 
| Arrondissement | Sedan | 
| Canton | Sedan-1 | 
| Intercommunality | CA Ardenne Métropole | 
| Government | |
| • Mayor (2020–2026) | Denis Aupretre [1] | 
| Area 1 | 3.84 km2 (1.48 sq mi) | 
| Population  (2022) [2]  | 404 | 
| • Density | 110/km2 (270/sq mi) | 
| Time zone | UTC+01:00 (CET) | 
| • Summer (DST) | UTC+02:00 (CEST) | 
| INSEE/Postal code |  08445 /08350 | 
| Elevation | 162–307 m (531–1,007 ft) (avg. 173 m or 568 ft) | 
| 1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km2 (0.386 sq mi or 247 acres) and river estuaries. | |
Thelonne is a commune in the Ardennes department in northern France.
| Year | Pop. | ±% | 
|---|---|---|
| 1962 | 265 | — | 
| 1968 | 285 | +7.5% | 
| 1975 | 259 | −9.1% | 
| 1982 | 273 | +5.4% | 
| 1990 | 280 | +2.6% | 
| 1999 | 260 | −7.1% | 
| 2008 | 356 | +36.9% |