List of districts of Tamil Nadu in the context of "Kanyakumari district"

Coimbatore district is one of the 38 districts in the state of Tamil Nadu in India. Coimbatore is the administrative headquarters of the district. It is one of the most industrialised districts and a major textile, industrial, commercial, educational, information technology, healthcare and manufacturing hub of Tamil Nadu. The region is bounded by Tiruppur district in the east, Nilgiris district in the north, Erode district in the northeast, Palakkad district, Idukki district and small parts of Thrissur district and Ernakulam district of neighbouring state of Kerala in the west and south respectively. As of 2011, Coimbatore district had a population of 3,458,045 with a sex ratio of 1,000 and literacy rate of 84%.

Coimbatore district was part of the historical Kongu Nadu and was ruled by the Cheras as it served as the eastern entrance to the Palakkad Gap, the principal trade route between the west coast and Tamil Nadu. Coimbatore was in the middle of the Roman trade route that extended from Muziris to Arikamedu in South India. The medieval Cholas conquered the Kongu Nadu in the 10th century CE. The region was ruled by Vijayanagara Empire in the 15th century followed by the Nayaks who introduced the Palayakkarar system under which Kongu Nadu region was divided into 24 Palayams. In the later part of the 18th century, the Coimbatore region came under the Kingdom of Mysore and following the defeat of Tipu Sultan in the Anglo-Mysore Wars, the British East India Company annexed Coimbatore to the Madras Presidency in 1799. The Coimbatore region played a prominent role in the Second Poligar War (1801) when it was the area of operations of Dheeran Chinnamalai. In 1804, Coimbatore was established as the capital of the newly formed Coimbatore district. The district experienced a textile boom in the early 19th century due to the decline of the cotton industry in Mumbai.

The Nīlgiris district (Tamil: [n̪iːlɐɡiɾi]) is one of the 38 districts in the southern Indian state of Tamil Nadu. Nīlagiri (lit. 'Blue Mountains') is the name given to a range of mountains spread across the borders among the states of Tamil Nadu, Karnataka and Kerala. The Nilgiri Hills are part of a larger mountain chain known as the Western Ghats. Their highest point is the mountain of Doddabetta, height 2,637 m. The district is contained mainly within the Nilgiri Mountains range. The administrative headquarters is located at Ooty (Ootacamund or Udhagamandalam). The district is bounded by Coimbatore to the south, Erode to the east, and Chamarajnagar district of Karnataka and Wayanad district of Kerala to the north. As it is located at the junction of three states, namely, Tamil Nadu, Kerala, and Karnataka, significant Malayali and Kannadiga populations reside in the district. Nilgiris district is known for natural mines of Gold, which is also seen in the other parts of Nilgiri Biosphere Reserve extended in the neighbouring states of Karnataka and Kerala too.

Nilgiris district ranked first in a comprehensive Economic Environment index ranking districts in Tamil Nadu (except Chennai district) prepared by the Institute for Financial Management and Research in August 2009. Tea and coffee plantations have been important to its economy. As of 2011, the Nilgiris district had a population of 735,394, with a sex-ratio of 1,042 females for every 1,000 males.

Chennai district, formerly known as Madras district, is one of the 38 districts in the state of Tamil Nadu, India. It is the smallest and the most densely populated district in the state. The district is almost coterminous with the city of Chennai, which is administered by the Greater Chennai Corporation, except for Madipakkam-B / Madipakkam-II revenue village which is administered by Kovilambakkam rural village panchayat as Kovilabakkam panchayat wards 3,4 and 5 but is under Zone-14 (Puzhuthivakkam) of Greater Chennai Corporation for Disaster and Revenue Management purpose. It is surrounded by Tiruvallur district in the north and the west, Kanchipuram district in the south-west, Chenglpattu district in the south, and the Bay of Bengal in the east.

As of 2011, the district had a population of 67,48,026 with a sex-ratio of 989 females for every 1,000 males. Much of the district's population descended from its settlements in the 1st century CE to the Middle Ages, but the diversity has grown much since then. The district consists of two civic bodies, the megacity of Chennai and Kovilabakkam rural village panchayat wards 3, 4 and 5 (Madipakkam-B / Madipakkam-II revenue village colloquially known as Sunnambu Kolathur), which forms the core and the most notable portion of the much bigger Chennai metropolis, or officially, the Chennai Metropolitan Area. In 2018, the district's limits were expanded, aligning with that of the newly expanded Greater Chennai Corporation, which had annexed adjacent municipalities. It resulted in the area being increased from 175 square kilometres (68 sq mi) to 426 square kilometres (164 sq mi). The district is divided into three revenue divisions and ten taluks.

Pudukkottai district is one of the 38 districts of Tamil Nadu state in southern India. The city of Pudukkottai is the district headquarters. It is also known colloquially as Pudhugai. The city is also known as Thondaiman Pudukkottai.

Pudukkottai district is bounded on the northeast and east by Thanjavur District, on the southeast by the Palk Strait, on the southwest by Ramanathapuram and Sivaganga districts, and on the west and northwest by Tiruchirapalli District. As of 2011, the district had a population of 1,618,345 with a sex-ratio of 1,015 females for every 1,000 males.