Gerasanahalli is a village in Hunsur tehsil in district of Mysore, Karnataka, India. As per the data provided by Census of India in 2011, total population of Gerasanahalli was 1,841 which includes 920 males and 921 females. Gerasanahalli covers 325.82 ha area. Pincode of Gerasanahalli is 571311.