Province of Gorizia
In the 16th century, the area became part of the County of Gorizia and Gradisca. During the World War I, Tolmin served as a base for the victorious breach of the Soča/Isonzo Front. Occupied by Italian troops at the end of 1918, it was part of the Kingdom of Italy between 1918 and 1943 (nominally to 1947) as a commune of the Province of Gorizia (as Tolmino), except during the period between 1924 and 1927, when the Province of Gorizia was abolished and annexed to the Province of Udine. and between 1943 and 1945 of the Nazi German Operational Zone Adriatic Coast. In 1945 it was liberated by the Yugoslav Partisans and in 1947 it was officially annexed to Yugoslavia. Since then, it has been an integral part of Slovenia.