Tarn is a department in the Occitania region in Southern France. Named after the river Tarn, it had a population of 389,844 as of 2019. Its pref…Tarn is a department in the Occitania region in Southern France. Named after the river Tarn, it had a population of 389,844 as of 2019. Its prefecture and largest city is Albi; it has a single subprefecture, Castres. In French, the inhabitants of Tarn are known as Tarnais and Tarnaises. Its INSEE and postcode number is 81.
