The district has eight taluks (subdivisions): Tiruchengode, Namakkal, Rasipuram, Paramathi Velur, Senthamangalam, Kumarapalayam, Kolli Hills and Mohanur.

Then, the Allala Ilaya Nayakar Vettuva Gounder king came to power in 1623 CE under the Vijayanagara Kingdom.

The river Kaveri flows south and southwest hugging the district's borders with Karur and Erode.

The district is situated in the dividing portion of two watersheds between Cauvery and the Vellar System with the Taluks of Attur, Rasipuram and Namakkal on the East and Salem, Omalur and Mettur on the West.

Mettur East Bank canal irrigates Pallipalayam Block with an area of 4,585 Ha.

According to 2011 census, Namakkal district had a population of 1,726,601 with a sex-ratio of 986 females for every 1,000 males, much above the national average of 929.

Among oil, seeds, groundnut, castor, and gingelly (sesame) occupy important places.

Using tapioca as raw material about 350 factory units are engaged in the production of Starch and Sago in Namakkal District.

Namakkal district is noted for truck and lorry external body building industry which dates back to 1956.

Nationwide Namakkal is known for body building for truck, trailer, tanker and rig unit.

Throughout India, Tiruchengode is known for its body building industry for trucks, trailers, tankers, and rig units.

Easily accessible from Erode, Salem and Trichy, and spread over 25 acres, the campus includes a driving range with every conceivable road configuration.

A spacious building accommodates large classrooms, a library, a model room, a laboratory and a cafeteria with an open-air theatre attached.

The roads come with electronic signals, signs, markings and streetlights for night driving – everything, in fact, that drivers will encounter on the highways.

The presiding deity is depicted as half-male and half-female, vertically to represent Shiva and Parvati worshipped as one form.

The Kolli hills are featured in several works of classical Tamil literature such as Silappathigaram, Manimekalai, Purananuru and Ainkurnuru.

The region was ruled by Valvil Ori whose valor and marksmanship are sung by several poets, and his exploits are a popular part of folklore.

It is because early literature records the existence of a deity called Kollippavai on top of these hills.

[citation needed] The Valvil Ori festival is organised there every year during the month of August.

This Shiva temple is said to have been built by Valvil Ori king in the 1st or 2nd century CE when he ruled this area.

It is the main centre for linking other districts via bus routes, to the North (Salem, Villupuram, Dharmapuri, Krishnagiri and Bangalore), East (Tiruchirapalli, Thanjavur, Thiruvarur and Nagapattinam), South (Karur, Dindugal, Madurai, Tiunelveli and Kanyakumari) and the West (Erode, Coimbatore, Tirupur and Nilgiris).

The train route between Karur and Salem Junction saves fuel and time for transportation of goods.