Which are the largest and smallest districts of Tamil Nadu by area?

Largest district by area: Dindigul (6,267 sq km). Second largest: Vellore (was large before bifurcation — now Tirupattur carved out). Smallest district by area: Chennai (174 sq km) — most densely populated. Other small districts: Ariyalur, Tiruvarur. Most populous district: Chennai. Least populous: Perambalur.

Which districts of Tamil Nadu have special economic or industrial significance?

Key industrial districts: (1) Chennai — IT hub, automobile (Hyundai, BMW), port, petrochemicals; (2) Coimbatore — textile machinery, engineering, 'Manchester of South India'; (3) Tiruppur — knitwear exports, ~50% of India's knitwear exports; (4) Salem — steel (SAIL), textile, mangoes; (5) Hosur (Krishnagiri) — electronics (Samsung, Foxconn), EV manufacturing (Ola, Ather, Tata); (6) Thoothukudi — port, SPIC, copper smelting; (7) Pudukottai — granite exports; (8) Vellore — leather goods, medical tourism (CMC Vellore); (9) Erode — turmeric ('Turmeric City'), handloom; (10) Madurai — textiles, tourism, BHEL.

Which Tamil Nadu districts are in coastal areas and what is their significance?

Tamil Nadu has a coastline of 1,076 km — 2nd longest in India after Gujarat. Coastal districts (13): Chennai, Villupuram (partially), Cuddalore, Nagapattinam, Tiruvarur, Thanjavur (partially), Pudukkottai, Ramanathapuram, Thoothukudi, Tirunelveli, Kanniyakumari, and Chengalpattu and Mayiladuthurai. Key coastal features: Gulf of Mannar Marine National Park (Ramanathapuram); Palk Strait (separates India-Sri Lanka); Point Calimere (Ramsar site, Nagapattinam); Colachel (historic — Dutch defeated by Travancore King Marthanda Varma, 1741); Kanyakumari — southernmost tip; convergence of Bay of Bengal, Arabian Sea, Indian Ocean.

Tamil Nadu Districts — Complete Reference for TNPSC Group 1

Tamil Nadu — Key Statistics

Indicator	Value
Total districts	38
Area	1,30,058 sq km (11th largest state)
Population (2011 Census)	7.21 crore (6th most populous)
Coastline	1,076 km (2nd longest after Gujarat)
Capital	Chennai
State animal	Nilgiri Tahr
State bird	Emerald Dove (Green Pigeon)
State tree	Palmyra Palm (Borassus flabellifer)
State flower	Gloriosa Lily (Kanakambaram)
Official language	Tamil
Borders	Kerala (W), Karnataka (NW), Andhra Pradesh (N); Bay of Bengal (E); Indian Ocean (S)

All 38 Districts — Quick Reference

Chennai Division

District	HQ	Key Features
Chennai	Chennai	Capital; largest city; IT corridor (OMR); port; auto hub; smallest district (174 sq km)
Chengalpattu	Chengalpattu	New district (2019, from Kancheepuram); IT SEZs; Mahabalipuram (UNESCO WHS)
Kancheepuram	Kancheepuram	Silk sarees; temple city (1,000 temples); Pallava capital
Tiruvallur	Tiruvallur	Industrial corridor; auto components; SIPCOT parks

Vellore Division

District	HQ	Key Features
Vellore	Vellore	Leather industry; CMC (Christian Medical College); Vellore Fort
Ranipet	Ranipet	New district (2019, from Vellore); leather exports; tanneries
Tirupattur	Tirupattur	New district (2020, from Vellore); silk weaving; Yelagiri hills
Krishnagiri	Krishnagiri	Mango hub; Hosur — EV manufacturing (Ola, Ather); Samsung
Dharmapuri	Dharmapuri	Hogenakkal waterfalls; granite; mango; sericulture

Salem Division

District	HQ	Key Features
Salem	Salem	Steel (SAIL Salem Steel Plant); textile; mango; iron ore deposits
Namakkal	Namakkal	Poultry capital of TN; lorry body building; eggs export
Erode	Erode	Turmeric ('Yellow City'); handloom; power loom; Bhavani river
Tiruppur	Tiruppur	Knitwear capital; ~50% of India's hosiery exports; Noyyal river

Coimbatore Division

District	HQ	Key Features
Coimbatore	Coimbatore	'Manchester of South India'; textile machinery; engineering; Nilgiris gateway
Tiruppur	(see above)
Nilgiris	Ooty (Udhagamandalam)	Tea; Nilgiri Biosphere Reserve; Doddabetta (highest peak in TN — 2,637 m); Nilgiri Tahr
Dindigul	Dindigul	Largest district by area; locks ('Lock City'); Kodaikanal (hill station in Palani Hills)

Madurai Division

District	HQ	Key Features
Madurai	Madurai	'Athens of the East'; Meenakshi Amman Temple; BHEL; textile; Vaigai river
Theni	Theni	Cardamom; grapes; Suruli falls; border with Kerala
Virudhunagar	Virudhunagar	Fireworks ('Fireworks City'); matches; Aruppukottai; Sivakasi nearby
Sivaganga	Sivaganga	Historical (Kattabomman's territory); handloom; Karaikudi
Ramanathapuram	Ramanathapuram	Gulf of Mannar Marine NP; Rameswaram; Pamban Bridge; coral reefs

Tirunelveli Division

District	HQ	Key Features
Tirunelveli	Tirunelveli	Halwa; Tamiraparani river; Kalakad Mundanthurai Tiger Reserve
Tenkasi	Tenkasi	New district (2019); Courtallam (Kutralam) waterfalls; paper mills
Thoothukudi	Thoothukudi (Tuticorin)	Port city; SPIC; Sterlite copper (controversially closed 2018); pearl fishing
Kanniyakumari	Nagercoil	Southernmost tip of India; convergence of 3 seas; Vivekananda Rock; wind energy

Trichy Division

District	HQ	Key Features
Tiruchirappalli	Tiruchirappalli (Trichy)	Rock Fort; Bharat Heavy Electricals (BHEL); refinery; Cauvery banks
Perambalur	Perambalur	Least populous district; cement; limestone
Ariyalur	Ariyalur	Cement; limestone; dinosaur fossil site (first in TN)
Karur	Karur	Textile weaving; bus body building; Cauvery banks
Pudukkottai	Pudukkottai	Granite exports; Sittannavasal cave paintings (Jain); Thirumayam Fort

Thanjavur Division

District	HQ	Key Features
Thanjavur	Thanjavur	'Rice Bowl of TN'; Brihadeeswara Temple (UNESCO WHS); Cauvery delta; Carnatic music
Tiruvarur	Tiruvarur	Cauvery delta; paddy; birthplace of Carnatic Trinity (Tyagaraja, Dikshitar, Syama Sastri)
Nagapattinam	Nagapattinam	Cyclone-prone; Velankanni shrine; Point Calimere (Ramsar); 2004 tsunami impact
Mayiladuthurai	Mayiladuthurai	Newest district (2020, carved from Nagapattinam); Cauvery delta rice; Sirkazhi

Cuddalore Division

District	HQ	Key Features
Cuddalore	Cuddalore	SIPCOT industrial estate; chemicals; NTPC power plant; Pichavaram mangroves
Villupuram	Villupuram	Gingee Fort; sugarcane; limestone
Kallakurichi	Kallakurichi	New district (2019, from Villupuram); sugarcane; hosiery

Vellore & North Division (continued)

District	HQ	Key Features
Tiruvannamalai	Tiruvannamalai	Arunachala hill; Ramana Maharshi ashram; granite; mango

Pudukottai & Tanjore Region

District	HQ	Key Features
Sivaganga	(see above)

Districts by Region

Cauvery Delta Districts (Granary of TN)

Thanjavur · Tiruvarur · Nagapattinam · Mayiladuthurai · Trichy · Karur

Major crop: Paddy (Samba, Ponni varieties)
Irrigation: Cauvery + Grand Anicut (Kallanai Dam — built by Karikala Chola, 2nd century CE)

Western Ghats Districts (Plantation Crops)

Nilgiris · Coimbatore · Dindigul · Theni · Tirunelveli · Kanniyakumari

Crops: Tea (Nilgiris), Coffee, Cardamom, Rubber
Wildlife: Mudumalai, Anamalai, KMTR tiger reserves

Coastal Districts

Chennai · Chengalpattu · Villupuram · Cuddalore · Nagapattinam · Tiruvarur · Thanjavur · Pudukkottai · Ramanathapuram · Thoothukudi · Tirunelveli · Kanniyakumari · Mayiladuthurai

Fisheries; ports; cyclone risk; Ramsar wetlands

Industrial Corridor Districts

Chennai → Tiruvallur → Kancheepuram → Chengalpattu → Vellore → Krishnagiri

Tamil Nadu's industrial spine (National Manufacturing Investment Zone, Delhi-Chennai Industrial Corridor)

Key Rivers and Their Districts

River	Districts Covered	Joins
Cauvery	Trichy, Thanjavur, Tiruvarur, Nagapattinam	Bay of Bengal at Poompuhar
Vaigai	Madurai, Ramanathapuram	Palk Strait (Ramnad)
Tamiraparani	Tirunelveli, Thoothukudi	Gulf of Mannar
Bhavani	Erode, Tiruppur, Coimbatore	Joins Cauvery at Bhavani Sangamam
Palar	Vellore, Kancheepuram, Chengalpattu	Bay of Bengal near Kalpakkam
Noyyal	Coimbatore, Tiruppur, Karur, Erode	Joins Cauvery
Amaravathi	Tiruppur, Karur	Joins Cauvery at Karur
Pennaiyar	Dharmapuri, Krishnagiri, Tiruvannamalai, Villupuram	Bay of Bengal

Major Industries — District Map

Industry	Key Districts
Automobile	Chennai (Hyundai, BMW, Ford, TVS), Hosur/Krishnagiri (Ola, Ather, Tata EV)
IT / Software	Chennai (OMR — IT corridor), Coimbatore, Madurai
Textile / Garment	Coimbatore, Tiruppur, Erode, Salem, Karur
Leather	Vellore, Ranipet, Chennai
Knitwear	Tiruppur
Steel	Salem (SAIL)
Engineering / Heavy	Trichy (BHEL), Madurai (BHEL unit)
Chemicals / Petrochemicals	Chennai (CPCL), Cuddalore (SIPCOT), Thoothukudi (SPIC)
Fireworks / Matches	Virudhunagar (Sivakasi)
Granite	Pudukkottai, Dharmapuri, Krishnagiri
Cement	Ariyalur, Perambalur
Poultry / Eggs	Namakkal
Tea	Nilgiris

New Districts Created After 2018

District	Year	Carved from	HQ
Ranipet	2019	Vellore	Ranipet
Tenkasi	2019	Tirunelveli	Tenkasi
Chengalpattu	2019	Kancheepuram	Chengalpattu
Kallakurichi	2019	Villupuram	Kallakurichi
Tirupattur	2020	Vellore	Tirupattur
Mayiladuthurai	2020	Nagapattinam	Mayiladuthurai

Ramsar Wetland Sites in Tamil Nadu (7 Sites)

Site	District
Vedanthangal Bird Sanctuary	Chengalpattu
Karikili Bird Sanctuary	Chengalpattu
Pallikaranai Marsh	Chennai
Pichavaram Mangrove	Cuddalore
Point Calimere	Nagapattinam
Kanjirankulam Bird Sanctuary	Ramanathapuram
Suchindram Theroor Wetland Complex	Kanniyakumari

Board Exam Tips — TN Districts

TN has 38 districts (latest: Mayiladuthurai 2020, Tirupattur 2020)
Largest district by area = Dindigul; Smallest = Chennai (174 sq km)
Cauvery delta = Thanjavur, Tiruvarur, Nagapattinam, Mayiladuthurai — rice bowl of TN
Doddabetta (2,637 m) = highest peak in TN — Nilgiris district
Sivakasi = fireworks + matches = Virudhunagar district
Tiruppur = knitwear; Coimbatore = engineering/textile; Hosur = EVs; Salem = steel
Vellore = CMC hospital + leather; Namakkal = poultry capital
Kancheepuram = silk sarees + 1,000 temples; Thanjavur = Brihadeeswara + Carnatic music
Kanniyakumari = southernmost tip; 3 seas meet; wind energy
TN coastline = 1,076 km (2nd longest after Gujarat)
Ramsar sites in TN = 7 (Vedanthangal, Karikili, Pallikaranai, Pichavaram, Point Calimere, Kanjirankulam, Suchindram)
State animal = Nilgiri Tahr; State bird = Emerald Dove; State tree = Palmyra Palm; State flower = Gloriosa Lily

Frequently Asked Questions

Tamil Nadu has 38 districts (as of 2022). Originally 32 districts were reorganised in 1976. New districts created subsequently: Ariyalur (2007), Tiruppur (2009), Ranipet (2019), Tenkasi (2019), Chengalpattu (2019), Kallakurichi (2019), Mayiladuthurai (2020), Tirupattur (2020) — total now 38. The most recent addition was Mayiladuthurai district carved from Nagapattinam in 2020.