Alandur is the 285th most populous city in India with a total population of 1,64,430. Alandur is a city in the Chennai district of Tamil Nadu and the highest employment in the district is in Agriculture, Beverages & Food products, Textile, Rubber/Plastic , Metal, Readymade garments and other household industries. The district has 1% of the workforce employed in the Agricultural Sector, 97% in the Industrial Sector and the remaining 2% are Household workers. Alandur is a zone of Chennai corporation, and an urban node in Chennai district in the state of Tamil Nadu, India. Chennai and the surrounding region have served as an important administrative, economic, military and political centre for centuries. In the ancient and medieval period, the prominent dynasties that ruled this region included the Cheras, Cholas, Pandyas and the Pallavas of Kanchi. The Portuguese arrived here in 1522 and built one of the oldest churches, St. Thomas Church, at the location where St Thomas was martyred. The church was rebuilt by the British in 1893.