Rathnagiri is a village in Denkanikottai tehsil in district of Krishnagiri, Tamil Nadu, India. As per the data provided by Census of India in 2011, total population of Rathnagiri was 2,342 which includes 1,221 males and 1,121 females. Rathnagiri covers 1052.73 ha area. Pincode of Rathnagiri is 635107.