An urban agglomeration is defined as "a continuous urban spread constituting a town and its adjoining outgrowths, or two or more physically contiguous towns together with or without outgrowths of such towns". An urban agglomeration must consist of at least a statutory town and its total population (i.e. all the constituents put together) should not be less than 20,000.
List
Below is a list of urban agglomerations in the state of Tamil Nadu, with a population of 1 lakh and above based on the 2011 census of India.[1] Cities in bold are declared Municipal corporations.
Ten largest urban agglomerations in Tamil Nadu
Rank
|
City
|
District
|
Population
2011
|
1
|
Chennai
|
Chennai
|
8,696,010
|
2
|
Coimbatore
|
Coimbatore
|
2,151,466
|
3
|
Madurai
|
Madurai
|
1,462,420
|
4
|
Tiruchirappalli
|
Tiruchirappalli
|
1,021,717
|
5
|
Tiruppur
|
Tiruppur
|
962,982
|
6
|
Salem
|
Salem
|
919,950
|
7
|
Erode
|
Erode
|
521,776
|
8
|
Tirunelveli
|
Tirunelveli
|
498,924
|
9
|
Vellore
|
Vellore
|
481,966
|
10
|
Thoothukudi
|
Thoothukudi
|
410,760
|
11
|
Dindigul
|
Dindigul
|
292,132
|
12
|
Thanjavur
|
Thanjavur
|
290,724
|
13
|
Ranipet
|
Ranipet district
|
262,346
|
14
|
Sivakasi
|
Virudhunagar
|
234,688
|
15
|
Karur
|
Karur
|
233,763
|
16
|
Udhagamandalam
|
Nilgiris
|
233,374
|
17
|
Hosur
|
Krishnagiri
|
229,507
|
18
|
Nagercoil
|
Kanyakumari
|
224,849
|
19
|
Kancheepuram
|
Kancheepuram
|
221,749
|
20
|
Komarapalayam
|
Namakkal
|
194,992
|
21
|
Karaikudi
|
Sivaganga
|
181,347
|
22
|
Neyveli
|
Cuddalore
|
178,925
|
23
|
Cuddalore
|
Cuddalore
|
173,361
|
24
|
Kumbakonam
|
Thanjavur
|
167,098
|
25
|
Tiruvannamalai
|
Tiruvannamalai
|
144,683
|
26
|
Pollachi
|
Coimbatore
|
135,235
|
27
|
Rajapalayam
|
Virudhunagar
|
130,119
|
28
|
Gudiyatham
|
Vellore
|
124,274
|
29
|
Pudukottai
|
Pudukottai
|
117,215
|
30
|
Vaniyambadi
|
Tirupattur
|
116,712
|
31
|
Ambur
|
Tirupattur
|
113,856
|
32
|
Nagapattinam
|
Nagapattinam
|
102,838
|