Snails act as an intermediate host for trematode infection. A total of 989 snails were collected from 2 agro-climatic zones of TamiI Nadu viz., northeastern (Kancheepuram and Vellore) and hilly zone (The Nilgiris) from 2012 to 2015. Collected snails were identified as aquatic (Radix auricularia, R. luteola, Indoplanorbis exustus, I. difference, Gyraulus convexiusculus, Melanoides tuberculatus, M. crabra, Bithynia sp., B. pulchella, B. dissimilis, Bellamya crassispiralis, B. dissimilis, Bellamyia b. halophila, Bellamyia b.eburnea, B. bengalensis race doliaris, B. bengalensis form typica, B. b. anandeli, Vivipara, Terebia ranifera, Gabbia stenothyroides, G.arcula, Paludomas tranchauricus, P. regulata, Stenothyra blanfordiana), amphibious snails (Pila globosa, P.virians and Pila sp.,) and land snails (Cryptozona semirugata, C. madarasapatinum, C. bistrialis, C. ligulata, Acahitina fulica). Highest percentage of snails was observed in plains (north eastern zone) than the hilly regions (78.16 % vs 21.84 %). In the plains, aquatic snails (90.70 %) were more than the amphibious (7.38 %) and land snails (1.92 %). In the plain, aquatic snails like genus Bithynia snails (29.99 %) were more followed by Bellamyia (12.37 %), Radix (10.48 %), Melanoides (9.92 %) and Indoplanorbis (8.36 %) and other snails whereas genus Pila and Cryptozona and Achatina were of the amphibious and land snails respectively. In the hills, only R. auriculara, R.luteola and S. blanfordiana was recorded. Out of these, R.auricularia was found more (83.33 %) than the R.luteola (13.89 %) and S. blanfordiana (2.78 %).