Kolsiya is a village in Nawalgarh tehsil in district of Jhunjhunun, Rajasthan, India. As per the data provided by Census of India in 2011, total population of Kolsiya was 4,063 which includes 2,046 males and 2,017 females. Kolsiya covers 1069 ha area. Pincode of Kolsiya is 333012.