The capital city of Turkey is Ankara. The territory of Turkey is subdivided into 81 provinces for administrative purposes. The provinces are organized into 7 regions for census purposes; however, they do not represent an administrative structure. Each province is divided into districts, for a total of 923 districts.

Provinces usually bear the same name as their provincial capitals, also called the central district; exceptions to this are the provinces of Hatay (capital: Antakya), Kocaeli (capital: İzmit) and Sakarya (capital: Adapazarı). Provinces with the largest populations are İstanbul (+12 million), Ankara (+4.4 million), İzmir (+3.7 million), Bursa (+2.4 million), Adana (+2.0 million) and Konya (+1.9 million).

The biggest city and the pre-Republican capital İstanbul is the financial, economic and cultural heart of the country. Other important cities include İzmir, Bursa, Adana, Trabzon, Malatya, Gaziantep, Erzurum, Kayseri, Kocaeli, Konya, Mersin, Eskişehir, Diyarbakır, Antalya and Samsun. An estimated 70.5% of Turkey's population live in urban centers. In all, 18 cities have populations that exceed 1 million inhabitants, and 21 cities have populations between 1 million and 500,000 inhabitants. Only two cities have populations less than 100,000.

Source: (Wikipedia)