Chak Umar is a village in Sahdai Buzurg tehsil in district of Vaishali, Bihar, India. As per the data provided by Census of India in 2011, total population of Chak Umar was 133 which includes 73 males and 60 females. Chak Umar covers 59 ha area. Pincode of Chak Umar is 844506.