Gaillac is a commune in the Tarn department in southern France. It had in 2013 a population of 14,334 inhabitants. Its inhabitants are called Gai…Gaillac is a commune in the Tarn department in southern France. It had in 2013 a population of 14,334 inhabitants. Its inhabitants are called Gaillacois. Gaillac is a town situated between Toulouse, Albi and Montauban. It has gained much recognition due to the wines that bear the town's name. The river Tarn runs along the border of the town by the south, east and west. It lies 50 km north-east of Toulouse. It is a market town and is the commercial centre of the north-west of Tarn.