Castres is the sole subprefecture of the Tarn department in the Occitanie region in Southern France. It lies in the former province of Languedo…Castres is the sole subprefecture of the Tarn department in the Occitanie region in Southern France. It lies in the former province of Languedoc, although not in the former region of Languedoc-Roussillon. In 2018, the commune had a population of 41,795.
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