Jamunamarathoor also known as Jamunamarathur, is a town in the top of Jawathu Hills. It has a population of 9861 and altitude of 857m.
It is the second highest altitude town in Thiruvannamalai district. It became a 3rd grade town Panchayat in 1999 and second grade in 2008. There is a Forest Government Higher Secondary School in the village.
In February 2026, a Rs.103 crore project was sanctioned to extend the single lane highway into a two-lane highway road.