Udayathoor is a village in Radhapuram tehsil in district of Tirunelveli, Tamil Nadu, India. As per the data provided by Census of India in 2011, total population of Udayathoor was 4,550 which includes 2,224 males and 2,326 females. Udayathoor covers 3712.91 ha area. Pincode of Udayathoor is 627111.