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A department of the Occitanie region in southern France, administered from Albi.

Last updated August 24, 2026

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Overview

Tarn is a French department in the Occitanie region of southern France. It takes its name from the Tarn River, which crosses the territory, and is identified administratively by the number 81 and by the postal code prefix associated with the department. Albi serves as the prefecture and largest city, while Castres is the department's only subprefecture. Inhabitants are commonly called Tarnais and Tarnaises. The department was established on 4 March 1790 during the administrative reorganisation introduced by the French Revolution, following the law of 22 December 1789. Its territory was formed largely from parts of the former province of Languedoc and included areas associated historically with the dioceses of Albi and Castres. The early department was divided into five districts: Albi, Castres, Lavaur, Gaillac and Lacaune. Although Albi was the capital at the department's creation, the administrative seat moved to Castres in 1797 before returning to Albi in 1800, when the arrondissement system was introduced. The arrondissements of Gaillac and Lavaur were later abolished in 1926. Tarn covers approximately 5,758 square kilometres. Its landscape generally falls from east to west and combines uplands, wooded mountain areas, plateaux, vineyards, agricultural valleys and river corridors. The principal southeastern ranges are the Mountains of Lacaune, the Sidobre and the Montagne Noire, which form part of the wider Cévennes system. Puech Montgrand, at approximately 1,267 metres, is the department's highest point. The Sidobre is known for its granite landscapes and separates the valleys of the Agout and Thoré. Most of Tarn drains toward the Garonne basin, while a small part of the Montagne Noire drains toward the Aude. The department is entirely surrounded by other departments within Occitanie: Hérault, Aude, Aveyron, Haute-Garonne and Tarn-et-Garonne. This setting gives Tarn a position between the Toulouse metropolitan area, the Mediterranean hinterland and the upland territories to the east. Its territory includes 2 arrondissements, 23 cantons and 314 communes. Albi and Castres are the principal urban centres, supported by smaller towns and rural communities. Tarn is a public administrative territory rather than a commercial consumer brand. Its institutional activity centres on local government, public services, transport and infrastructure, education, social policy, environmental management, economic development and tourism promotion. The prefecture represents the French national administration in the department, while the Departmental Council manages responsibilities devolved to the departmental level. Tourism communications also present Tarn's historical towns, landscapes, cultural heritage, vineyards, rural areas and outdoor destinations. The department had a population of 397,352 in 2023, with a density of approximately 69 inhabitants per square kilometre. Political and administrative responsibilities are exercised through the Departmental Council and the national parliamentary representation of the territory. Christophe Ramond has served as president of the Departmental Council since 2017 according to the referenced material.

History

Tarn was created as one of the 83 departments established during the French Revolution. Its formation followed the law of 22 December 1789 and took effect on 4 March 1790. The new department was assembled principally from territory belonging to the former province of Languedoc, including the historic areas associated with Albi and Castres. The first administrative structure consisted of five districts: Albi, Castres, Lavaur, Gaillac and Lacaune. Albi initially served as the sole capital, but the seat was transferred to Castres in 1797. In 1800, Albi again became the capital, coinciding with the establishment of the arrondissement system. Four arrondissements were created at that time: Albi, Castres, Gaillac and Lavaur. A later administrative reform eliminated the Gaillac and Lavaur arrondissements in 1926, leaving the structure centred on Albi and Castres. The boundaries of Tarn also reflect earlier ecclesiastical and administrative divisions. Under the law of 28 Pluviôse in Year 5 of the French Revolutionary calendar, Tarn exchanged the canton of Anglès with Hérault for Saint-Gervais-sur-Mare. Anglès remained part of Tarn, while Saint-Gervais-sur-Mare remained associated with Hérault. These changes illustrate the way departmental borders were adjusted as France consolidated its post-revolutionary administration. Geographically, Tarn is a transitional territory between the lowlands and uplands of southwestern France. The land rises toward the southeast, where the Mountains of Lacaune, the Sidobre and the Montagne Noire shape the landscape. Pastoral land is found on the exposed slopes of the Mountains of Lacaune, while the Sidobre is characterised by granite plateaux and large stone formations. The Montagne Noire is named for the forests covering its northern side. The department's highest summit is Puech Montgrand, rising to roughly 1,267 metres. The western and central parts of Tarn include limestone and sandstone foothills, fertile alluvial valleys, vineyards and fruit-growing areas. Most of the department belongs to the drainage basin of the Garonne through rivers including the Tarn and Agout. Only a limited area of the Montagne Noire drains toward the Aude. These physical contrasts have influenced settlement, agriculture, transport and tourism throughout the department. Modern Tarn is organised into 2 arrondissements, 23 cantons and 314 communes. Albi is the prefecture and largest commune, while Castres is the principal subprefecture. The Departmental Council has 46 seats and is responsible for a range of departmental competencies, including social services, roads, education-related facilities and territorial development. The national government is represented through the prefecture. The department also supports tourism promotion built around heritage, landscapes, rural activities and local cultural identity. The population reached 397,352 in 2023, corresponding to a density of about 69 inhabitants per square kilometre. Tarn remains an active administrative department within Occitanie, with its identity shaped by its revolutionary origins, Languedoc heritage, varied topography and two principal urban centres.

  • 2023

    Population recorded at 397,352

    [1]

    Tarn's population was reported as 397,352, with an approximate density of 69 inhabitants per square kilometre.

  • 2017

    Christophe Ramond becomes departmental council president

    [1]

    Christophe Ramond began serving as president of the Departmental Council of Tarn.

  • 1926

    Arrondissement reform

    [1]

    The arrondissements of Gaillac and Lavaur were abolished, simplifying the department's administrative structure.

  • 1800

    Albi restored as capital

    [1]

    Albi again became the capital when the arrondissement system was introduced, with Albi, Castres, Gaillac and Lavaur forming the four arrondissements.

  • 1797

    Capital transferred to Castres

    [1]

    The departmental capital moved from Albi to Castres.

  • 1790

    Creation of the department

    [1]

    Tarn was established on 4 March 1790 as one of the original French departments created during the Revolution, using territory largely drawn from the former province of Languedoc.

  • 1790

    Initial district structure

    [1]

    The new department was divided into the districts of Albi, Castres, Lavaur, Gaillac and Lacaune.

Products and positioning

Tarn is positioned as a territorial public institution and administrative department of France, combining national government representation through the prefecture with elected departmental administration and place-based economic, cultural and tourism functions.

Sources2 sources

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