The county covered 3337 km2 and was located in the central part of Greater Romania, in the southeast of Transylvania. Its territory comprised a large part of the current territory Covasna County. It was bordered west by Braşov County, to the north by the counties of Odorhei, Ciuc and Bacău, to the east by Putna County, and to the south by the counties of Buzău. The county was disbanded with the administrative reform of 6 September 1950.
History
Prior to World War I, the territory of the county belonged to Austria-Hungary and mostly was identical with the Háromszék County of the Kingdom of Hungary. The territory of Trei Scaune County was transferred to Romania from Hungary as successor state to Austria-Hungary in 1920 under the Treaty of Trianon. After the administrative unification law in 1925, the name of the county as it was, but the territory was reorganized. In 1938, King Carol II promulgated a new Constitution, and subsequently he had the administrative division of the Romanian territory changed. were created to be ruled by rezidenți regali - appointed directly by the King - instead of the prefects. Trei Scaune County became part of Ținutul Argeș. In 1940, nearly all of the county was transferred back to Hungary with the rest of Northern Transylvania under the Second Vienna Award; the small remainder was added to Putna County and Brașov County. Beginning in 1944, Romanian forces with Soviet assistance recaptured the ceded territory and reintegrated it into Romania, re-establishing the county. Romanian jurisdiction over the entire county per the Treaty of Trianon was reaffirmed in the Paris Peace Treaties, 1947. The county was disestablished by the communist government of Romania in 1950, and not re-established in 1968 when Romania restored the county administrative system.
Administrative organization
Administratively, Trei Scaune County was divided originally into four districts :
Plasa Baraolt, headquartered at Baraolt, containing 11 villages
Plasa Covasna, headquartered at Covasna, containing 27 villages
Plasa Sfântu Gheorghe, headquartered at Sfântu Gheorghe, containing 21 villages
Plasa Târgu Secuiesc, headquartered at Târgu Secuiesc, containing 29 villages
Later, a fifth district was added:
Plasa Ozun, headquartered at Ozun, containing 19 villages
Trei Scaune County contained two urban municipalities : Sfântu Gheorghe and Târgu Secuiesc.
Population
According to the 1930 census, the county counted 136,122 inhabitants, of which 80.4% were Hungarians, 16.0% Romanians, 2.2% Romanies, 0.6% Germans, 0.5% Jews, and other smaller minorities. From a religious point of view, the population was divided as follows: 40.6% Reformed, 36.1% Roman Catholic, 14.6% Eastern Orthodox, 4.6% Unitarian, 2.3% Greek Catholic, and other smaller minorities.
Urban population
The urban population was 15,925 in the 1930 census, and consisted of 78.2% Hungarians, 15.3% Romanians, 2.3% Jews, 1.6% Germans, 1.4% Romanies, and other smaller minorities. From the religious point of view, the urban population was made up of 45.0% Reformed, 31.5% Roman Catholic, 13.0% Eastern Orthodox, 3.0% Jewish, 2.9% Greek Catholic, 2.7% Unitarian, 1.7% Lutherans, and other smaller denominations.
