Thonachagondanahalli is a village in Madhugiri tehsil in district of Tumkur, Karnataka, India. As per the data provided by Census of India in 2011, total population of Thonachagondanahalli was 518 which includes 256 males and 262 females. Thonachagondanahalli covers 182.58 ha area. Pincode of Thonachagondanahalli is 572132.