Kusumthar is a village in Sona Rai Tharhi tehsil in district of Deoghar, Jharkhand, India. As per the data provided by Census of India in 2011, total population of Kusumthar was 939 which includes 478 males and 461 females. Kusumthar covers 76 ha area. Pincode of Kusumthar is 814150.