Ustou
| Ustou | |
|---|---|
| Ruins of the chateau of Mirabat | |
| Location of Ustou | |
| Coordinates: 42°47′59″N 1°15′52″E / 42.7997°N 1.2644°E | |
| Country | France | 
| Region | Occitania | 
| Department | Ariège | 
| Arrondissement | Saint-Girons | 
| Canton | Couserans Est | 
| Government | |
| • Mayor (2020–2026) | Alain Servat | 
| Area 1 | 98.34 km2 (37.97 sq mi) | 
| Population  (2022) | 259 | 
| • Density | 2.6/km2 (6.8/sq mi) | 
| Time zone | UTC+01:00 (CET) | 
| • Summer (DST) | UTC+02:00 (CEST) | 
| INSEE/Postal code | 09322 /09140 | 
| Elevation | 560–2,803 m (1,837–9,196 ft) (avg. 746 m or 2,448 ft) | 
| 1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km2 (0.386 sq mi or 247 acres) and river estuaries. | |
Ustou (French pronunciation: [ystu]; Occitan: Uston) is a commune in the Ariège department in southwestern France.
The commune of Ustou comprises several villages: Saint-Lizier, Le Trein, Sérac; and numerous hamlets, including: Escots, Bieille, Rouze.