Moncassin (French pronunciation: [mɔ̃kasɛ̃]; Occitan: Montcassin) is a commune in the Gers department in southwestern France.
Geography

The Petite Baïse flows north through the middle of the commune and forms parts of its northern border.
Population
| Year | Pop. | ±% |
|---|---|---|
| 1962 | 183 | — |
| 1968 | 177 | −3.3% |
| 1975 | 151 | −14.7% |
| 1982 | 138 | −8.6% |
| 1990 | 122 | −11.6% |
| 1999 | 119 | −2.5% |
| 2008 | 131 | +10.1% |
See also
References
- ^ “Répertoire national des élus: les maires”. data.gouv.fr, Plateforme ouverte des données publiques françaises (in French). 2 December 2020.
- ^ “Populations de référence 2023” (in French). National Institute of Statistics and Economic Studies. 18 December 2025.