Namakkal District is one of the 38 districts in the state of Tamil Nadu, India. The district was bifurcated from Salem District with Namakkal town as headquarters on 25 July 1996 and started to function independently from 1 January 1997. The district has eight taluks (subdivisions): Tiruchengode, Namakkal, Rasipuram, Paramathi Velur, Sendamangalam, Kumarapalayam, Kolli Hills and Mohanur. It has two revenue divisions: Tiruchengode and Namakkal. As of 2011 census, Namakkal district had a population of 1,726,601 with a sex-ratio of 986 females for every 1,000 males and Tiruchengode is the largest city in terms of population. Namakkal district is geographically affiliated to Kongu Nadu region. The district is famous for its large poultry industry, egg production and lorry bodybuilding industry, for which it is often referred to as "Egg City" and "Transport Hub of South India".

Salem District is one of the 38 districts of Tamil Nadu state in southern India. The district is now divided into Dharmapuri, Krishnagiri, Namakkal as individual districts. Salem is the district headquarters and other major towns in the district include Mettur, Tharamangalam, Thammampatti, Attur, Omalur, Sangagiri and Edappadi. That Salem dates to at least two thousand years ago is evident from the discovery of silver coins from the Roman Emperor Nero Claudius Caesar Augustus Germanicus found by Koneripatti of Salem in 1987. It was ruled by Mazhavar King Kolli Mazhavan and kings Adhiyaman and Valvil Ori of Sangam age. It is part of Mazhanadu, a vast region that dates to the second century BCE. Salem was the largest district of Tamil Nadu. It was bifurcated into Salem and Dharmapuri districts in 1965 and Namakkal district in 1997. Now Salem has been developed a lot by building many bridges and is considered to be the smart city. Salem is famous for cultivating mangoes.