Háromszék County
Háromszék was an administrative county of the Kingdom of Hungary. Situated in south-eastern Transylvania, its territory is now in central Romania.
Geography
Háromszék county shared borders with Romania and the Hungarian counties Csík, Udvarhely, Nagy-Küküllő, and Brassó. The river Olt flowed through the county. The Carpathian Mountains formed its southern and eastern border. Its area was around 1910.History
Háromszék means "three seats". Háromszék County was a combination of three seats of the Székelys: Kézdiszék, Orbaiszék, and Sepsiszék. The county was formed in 1876, when the administrative structure of Transylvania was changed.In 1920, under the Treaty of Trianon, the county became part of the Kingdom of Romania under the name Trei Scaune. After the Second Vienna Award of August 1940, the county was recreated with most of its historic territory as it became part of the Northern Transylvania territory of Hungary again until October 1944, towards the end of World War II.
Afterward, it became part of Romania again; its territory lies mainly in the present Romanian county of Covasna, with a small part in the south being part of Brașov County.
Demographics
| Census | Total | Hungarian | Romanian | Other or unknown |
| 1880 | 125,277 | 104,607 ' | 15,448 ' | 783 ' |
| 1890 | 130,008 | 110,799 ' | 17,360 ' | 1,849 ' |
| 1900 | 137,261 | 116,755 ' | 19,439 ' | 1,067 ' |
| 1910 | 148,080 | 123,518 ' | 22,963 ' | 1,599 ' |
| Census | Total | Calvinist | Roman Catholic | Eastern Orthodox | Unitarian | Greek Catholic | Other or unknown |
| 1880 | 125,277 | 54,548 ' | 41,468 ' | 21,338 ' | 5,029 ' | 1,962 ' | 932 ' |
| 1890 | 130,008 | 55,869 ' | 43,224 ' | 22,529 ' | 4,985 ' | 2,404 ' | 997 ' |
| 1900 | 137,261 | 57,861 ' | 45,681 ' | 24,761 ' | 5,102 ' | 2,465 ' | 1,391 ' |
| 1910 | 148,080 | 60,030 ' | 49,654 ' | 28,077 ' | 5,228 ' | 3,052 ' | 2,039 ' |