The celebrated battle between the armies of Uthiyan Cheral Athan and Chozhan Karikaal VaLavan during the Sangam Age, c. 100 CE, was fought at Venni (Sangam poem: Purananuru-66) at the place where main Vennar river branches into three.
According to the 2011 census, the taluk of Needamangalam had a population of 147,451 with 72,695 males and 74,756 females. There were 1028 women for every 1000 men. The taluk had a literacy rate of 74.99. Child population in the age group below 6 was 6,869 Males and 6,643 Females.
Needamangalam Taluk is crossed by the Vennar River in the north and the Korayar river in the south. Near the Bay of Bengal, the Venner River branches into three major distributaries, the northern branch retains its original name, Vennar. Other two branches are the Paminiyaar and the Koraiyar. They flow down to Muthupet Lagoon and from there join the sea.
Needamangalam is notable for the temples located around it, these include: Kasi Viswanathar Temple, Santhana Ramaswamy Temple, Kogamugaeswarer Temple, Mariyamman Temple, Yamunambal Temple, Drowpathi Amman Temple,Iyyappan Temple, Bathrakaliamman Temple & Aangeneya Temple). the town also host a Christian church and a Mosque.
The town of Needamangalam is a main hub for the villagers of the taluk, the majority of whom are farmers. Back in the 1950s - 1970's the town served as a wholesale market for paddy crops, and other crops.
Many people originally from Needamangalam taluk now work in Gulf countries and United States.
Scenic places in the taluk
Three kilometres from the town of Needamangalam is a place that is called Munar Thalaippu, this is the picnic spot for the people living in Needamangalam.
Notables from the taluk
This is the native place of musician Neelakanda Shastri and former Chief Election Commissioner of India Mr. N. Gopalaswami. A few People from Tamil film industry like cinematographer Gopinath and director Sami are also from here.
Other musicians 'Tavil Ulaga Mamethai' N.T.Meenakshi Sundaram Pillai and 'Tavil ulaga chakkaravarthi' N.T.M.Shanmuga Vadivel are from Needamangalam. Tamil film actor Sivakarthikeyan who is great grand son of Shanmuga Vadivel has his origins from Needamangalam.
- "Provisional Population Totals - Tamil Nadu-Census 2011" (PDF). Census Tamil Nadu. Retrieved 4 July 2013.