Katamachnahalli is a village in Chintamani tehsil in district of Chikkaballapura, Karnataka, India. As per the data provided by Census of India in 2011, total population of Katamachnahalli was 705 which includes 363 males and 342 females. Katamachnahalli covers 133.4 ha area. Pincode of Katamachnahalli is 563125.