Vaidyanathanpettai is a village in Thiruvaiyaru tehsil in district of Thanjavur, Tamil Nadu, India. As per the data provided by Census of India in 2011, total population of Vaidyanathanpettai was 2,358 which includes 1,167 males and 1,191 females. Vaidyanathanpettai covers 458.88 ha area. Pincode of Vaidyanathanpettai is 613204.