First-order subdivisions

Trakai Voivodeship

Trakai Voivodeship (Trakų vaivadija) was an administrative unit of the Grand Duchy of Lithuania from 1413 to 1795, created from the Trakai Duchy and second only to Vilnius Voivodeship in area and rank.

Trans Nzoia

Trans Nzoia County, Kenya county in former Rift Valley Province, capital Kitale, 990,341 people (2019), 2,495.6 km²; called Kenya's basket for commercial maize, tea, coffee, dairy.

Transcaspian Oblast

The Transcaspian Oblast (Закаспийская область) was an administrative division of the Russian Empire created in 1881 from conquered Turkmen lands along the eastern Caspian coast, after the storming of Gök-Tepe.

Transcaucasian Socialist Federative Soviet Republic (Закавказская Социалистическая Федеративная Советская Республика)

Transcaucasian Socialist Federative Soviet Republic (Zakavkazskaya SFSR, TSFSR, ZSFSR): Soviet federal republic uniting Azerbaijan, Georgia, and Armenia, 1922–1936; founding member of the USSR, capital Tbilisi, dissolved by the 1936 constitution.

Transvaal Colony

Transvaal Colony: British colony (1900–1910) replacing the Zuid-Afrikaansche Republiek north of the Vaal River; crown colony under Milner, responsible government 1906, Union of South Africa province 1910.

Trarza

Trarza (الترارزة) is a region of southwestern Mauritania, seat of a precolonial Moorish emirate founded after the Char Bouba war, now a 67,000 km² wilaya on the Senegal River with Rosso and Boutilimit.

Trentino

Trentino (Autonomous Province of Trento) is a mountainous northern Italian province of over 6,200 km² with special-statute legislative, administrative and fiscal autonomy, historically part of the prince-bishopric of Trento and County of Tyrol, annexed by Italy after World War I.

Oct 20, 2026

Tripoli (district)

Tripoli District (Tarabulus, LY-TB) is a first-order administrative division of Libya in northwestern Tripolitania containing the capital, population about 1,065,405, seat of the Government of National Unity.

Tripolitania

Tripolitania, historic northwestern region of Libya named for the three ancient cities Oea, Sabratha, and Lepcis Magna; former Ottoman vilayet, Italian colony, and one of Libya's three historic provinces, holding most of Libya's population with Tripoli as capital.

Tripura (ত্রিপুরা)

Tripura (ত্রিপুরা) is a landlocked state in Northeast India, bordered on three sides by Bangladesh, with its capital at Agartala and a population of 3.7 million.

Trøndelag

Trøndelag (Trööndelage), county number 50 in central Norway, formed 1 January 2018 by merging Nord-Trøndelag and Sør-Trøndelag; about 490,000 residents, 38 municipalities, administrative center Steinkjer, largest city Trondheim.

Oct 20, 2026

Trumbull County

Trumbull County, Ohio: county established July 10, 1800, named for Connecticut Governor Jonathan Trumbull; seat Warren; originally the whole Connecticut Western Reserve; 201,977 residents (2020).

Tsentral’no-Chernozëmnyy Ekonomicheskiy Rayon

Tsentral'no-Chernozëmnyy Ekonomicheskiy Rayon (Central Black Earth Economic Region, CBEER), a Russian economic region of Voronezh, Belgorod, Lipetsk, Kursk, and Tambov oblasts on fertile chernozem, combining ferrous metallurgy with major agriculture.

Tshopo

Tshopo is a province of the Democratic Republic of the Congo, created in 2015 from the former Orientale Province, with its capital at Kisangani and covering 199,567 km², the largest of the country's 26 provinces.

Tshuapa (district)

Tshuapa, former district of Équateur Province in the DRC, became a province in 2015 with capital Boende; Mongo-majority, forested central-basin province of six territories, agriculture-based economy, Salonga National Park.

Tsukushi Province

Tsukushi Province (筑紫国, also written 竺志国) was an ancient province of Japan in northern Kyushu, corresponding to present-day Fukuoka Prefecture and divided into Chikuzen and Chikugo by the late 7th century.

Oct 20, 2026

Tucumán Province

Tucumán Province, in northwest Argentina (NOA), is the country's smallest province (22,524 km²), capital San Miguel de Tucumán, where Argentine independence was declared on 9 July 1816; it leads national sugar and lemon production.

Tula Oblast

Tula Oblast (Тульская область), a Russian federal subject in the Central Federal District around the city of Tula; formed 1937, an old arms-making region, Hero City, 2020 census population 1,501,214, manufacturing 42.3% of GRP.

Tunceli Province

Tunceli Province (Dersim), an eastern Anatolian province of Turkey with capital Tunceli (formerly Kalan), 7,432 km², renamed from Dersim by the 25 December 1935 Tunceli Law; eight districts, one of Turkey's least populous provinces.

Tungurahua (district)

Tungurahua province, Ecuador (capital Ambato), created 3 July 1860 as Ambato province, renamed 1861 after Tungurahua volcano; nine cantons, 563,532 people (2022), 3,335 km2, second smallest province.

Turkana

Turkana County, capital Lodwar, is Kenya's second-largest county (77,000 km²) in the arid northwest, home to Lake Turkana and the Turkana pastoralists, with Kenya's highest poverty rate and severe drought vulnerability.

Turkestan Autonomous Soviet Socialist Republic

The Turkestan Autonomous Soviet Socialist Republic (TASSR) was an autonomous republic within the Russian SFSR, proclaimed in Tashkent in 1918 as the first Soviet state formation in Central Asia.

Turkestan Governorate-General

The Turkestan Governorate-General was the administrative unit through which the Russian Empire governed its Central Asian conquests from 1867 to 1917, with its capital at Tashkent.

Tuscany

Tuscany (Toscana) is an ordinary-statute region of central Italy, 22,990 km², capital Florence, ten provinces, about 3.7 million residents in 276 municipalities, manufacturing- and tourism-driven economy.

Tuva

Tuva (Republic of Tyva, Тыва Республика), a Russian federal subject in southern Siberia bordering Mongolia; capital Kyzyl. Known for xöömei throat singing, the independent Tuvan People's Republic (1921–1944), high birth rates, mining reserves, and no railway.

Tuyen Quang

Tỉnh Tuyên Quang (Tuyên Quang province): mountainous province in northeast Vietnam, formed 1 July 2025 by merging former Tuyên Quang and Hà Giang; 13,795.50 km², 1,865,270 people, 277.556 km China border, capital Tuyên Quang city.

Tyumen Oblast (Тюменская область)

Tyumen Oblast (Тюменская область), a Russian federal subject formed 14 August 1944 in Western Siberia, contains Khanty-Mansi and Yamalo-Nenets okrugs, spans about 1,464.2 thousand km², and supplies two thirds of Russian oil and over 90 percent of its gas.