Sainthia (formerly Nandipur) is a city and a municipality in Suri Sadar subdivision of Birbhum district in the Indian state of West Bengal.

Located on the banks of Mayurakshi River, Sainthia has been a major human settlement.

Sainthia's industrial prominence owes much to the Chandra family, who established the iconic "Lion Marka" (Lion Brand), the coconut oil manufactured and processed in a factory located beside the Mayurakshi River.

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 Sainthia railway station was done as part of building the entire line.

Sainthia, an old village trade center, a place of pilgrimage has been emerged into a municipal city in the year 1987.

[14] The Sainthia municipality area spread over 10 km2 (3.86 sq mi) and comprises 16 wards.

The north–south dimension of the city is comparatively narrow, stretching from the Mayurakshi River in the north to roughly Pariharpur Village in the south—a span of 2–3 km.

The child sex ratio is around 880, compared to the West Bengal state average of 956.

In the census survey, a worker is defined as a person who does business, job, service, cultivator, or labour activity.

Sainthia is an economically important city and one of the busiest business hubs in the middle part of West Bengal.

[18] The economy of Sainthia stands tall due to the sales of agricultural products.

The city is known as an export and import centre for cottage industry and agricultural based different goods.

The hinterland of business of Sainthia spreads up to the districts of Jharkhand in the west and Assam in the north east.

That makes the city the business centre of all sorts of goods distribution and transportation.

Ananda Mohan Chakrabarty (born 1938), microbiologist and scientist Sainthia is influenced much by the culture of West Bengal.

The festivals like Durga Puja is sincerely celebrated throughout the city of Sainthia by the local people.