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.
Cities in bold are administered as Municipal corporations.
+Urban agglomerations in Tamil NaduRankCityDistrictPopulation (2011)1ChennaiChennai8,696,0102CoimbatoreCoimbatore2,151,4663MaduraiMadurai1,462,4204TiruchirappalliTiruchirappalli1,021,7175TiruppurTiruppur962,9826SalemSalem919,9507ErodeErode521,7768TirunelveliTirunelveli498,9249VelloreVellore481,96610ThoothukudiThoothukudi410,76011DindigulDindigul292,13212ThanjavurThanjavur290,72413RanipetRanipet262,34614SivakasiVirudhunagar234,68815KarurKarur233,76316UdhagamandalamNilgiris233,37417HosurKrishnagiri229,50718NagercoilKanyakumari224,84919KancheepuramKancheepuram221,74920KomarapalayamNamakkal194,99221KaraikudiSivaganga181,34722NeyveliCuddalore178,92523CuddaloreCuddalore173,36124KumbakonamThanjavur167,09825TiruvannamalaiTiruvannamalai144,68326PollachiCoimbatore135,23527RajapalayamVirudhunagar130,11928GudiyathamVellore124,27429PudukottaiPudukottai117,21530VaniyambadiTirupattur116,71231AmburTirupattur113,85632NagapattinamNagapattinam102,838
See also List of most populous metropolitan areas in India List of cities in Tamil Nadu by population List of million-plus urban agglomerations in India
References