Troncens | |
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A general view of Troncens | |
![]() Location of Troncens | |
Location within France Location within Occitanie | |
| Coordinates: 43°27′41″N 0°12′57″E / 43.4614°N 0.2158°E | |
| Country | France |
| Region | Occitania |
| Department | Gers |
| Arrondissement | Mirande |
| Canton | Pardiac-Rivière-Basse |
| Intercommunality | Bastides et vallons du Gers |
| Government | |
| • Mayor (2020–2026) | Francis Daguzan |
Area 1 | 12.97 km2 (5.01 sq mi) |
| Elevation | 150 m (490 ft) |
| Highest elevation | 342 m (1,122 ft) |
| Lowest elevation | 182 m (597 ft) |
| Population (2023) | 159 |
| • Density | 12.3/km2 (31.8/sq mi) |
| Time zone | UTC+01:00 (CET) |
| • Summer (DST) | UTC+02:00 (CEST) |
| INSEE/Postal code | 32455 /32230 |
| 1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km2 (0.386 sq mi or 247 acres) and river estuaries. | |
Troncens is a commune in the Gers department of Gascony in the southwestern France.
Troncens is situated in the south of the department near the department of Hautes-Pyrénées.

The Cabournieu, right tributary of the Bouès, has its source in the town. Another tributary (left bank) of the Bouès, the Laus, runs through the town. The farms are dispersed throughout the area.
Historical population | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Source: EHESS and INSEE (1968-2023) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||