Sainthia (formerly Nandipur) is a city and a municipality in Suri Sadar subdivision of Birbhum district in the Indian state of West Bengal. The city is known as business city of Birbhum district. The city is under the jurisdiction of Sainthia police station. Sainthia is the fourth most populous city in Birbhum district and 95th most populous city in West Bengal. The city covers an area of 10 km2 and had a population of 44,601 in 2011. Located on the banks of Mayurakshi River, Sainthia has been a major human settlement. The city is famous for Nandikeshwari Temple, one of the Shakti Peethas in Indian subcontinent. It is believed that the name Sainthia is derived from 'Saaita', a term used in 'Khero Khata' (Business Book) by the merchants of Sainthia after worshiping Goddess Nandikeshwari in Poila Boishakh and Vijaya Dashami. Nandipur was the ancient name of Sainthia. The name Nandipur was originated from the famous temple of Nandikeshwari. The word Nandi comes from Nandikeshwari Temple and the word Pur is a Sanskrit term used for city. Together these words created Nandipur. Sainthia was a small village. Urbanization of this area gained momentum in the recent past, when construction work of the Sahibganj loop line and a bridge over the Mayurakshi River started. Construction of the Khana-Rajmahal section of Sahibganj Loop was completed in October 1859. Construction of the Sainthia railway station was done as part of building the entire line. This large project brought people from different corners of the country to assemble and settle here. Sainthia, an old village trade center, a place of has been emerged into a municipal city in the year 1987. Sainthia is located at . It has an average elevation of . The city is situated in the south bank of Mayurakshi River. The soil is generally alluvial and fertile. There was a rich reservoir of groundwater but this stands somewhat depleted due to overuse. Sainthia's climate is classified as tropical. In winter, there is much less rainfall in Sainthia than in summer.