Kathiruppu is a village in Sirkali tehsil in district of Nagapattinam, Tamil Nadu, India. As per the data provided by Census of India in 2011, total population of Kathiruppu was 2,413 which includes 1,200 males and 1,213 females. Kathiruppu covers 410.54 ha area. Pincode of Kathiruppu is 609109.