Pachapalayam is a village in Ulundurpettai tehsil in district of Viluppuram, Tamil Nadu, India. As per the data provided by Census of India in 2011, total population of Pachapalayam was 1,098 which includes 567 males and 531 females. Pachapalayam covers 516.34 ha area. Pincode of Pachapalayam is 606102.