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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

References

^ Urban Agglomerations and Cities having population 1 lakh and above (PDF). Provisional Population Totals, Census of India 2011 (Report). The Registrar General & Census Commissioner, India. Archived from the original (PDF) on 10 March 2020. Retrieved 10 August 2014.