According to 2011 census, Thirumangalam had a population of 51,194 with a sex-ratio of 1,013 females for every 1,000 males, much above the national average of 929.

In other way, it is said that when Lord Murugan married Theivanai in Thiruparankundram (nearest to Tirumangalam), the "Tirumangalyam" was made here and hence the name came.

During Tamil Nadu legislative assembly by-election, 2009-2010 for Tirumangalam held on 9 January over 89 percent of the votes were polled.

Regular bus services are available from all important cities of Tamil Nadu and all the Buses from Southern parts of the State pass through Tirumangalam.

All passenger trains running between Madurai, Tirunelveli, Nagercoil, Kollam (Quilon) stop at Tirumangalam.

AC urban buses used to start their services from Tirumangalam to Arappalayam Bus Terminus in Madurai.