Jaynagar Majilpur (Bengali: [d͡ʒɔe̯nɔgoɾ mod͡ʒɪlpuɾ] ⓘ) is a city and a municipality of South 24 Parganas district in the Indian state of West Bengal.

This silting is called Moje Jaoa in Bengali language, from which the city derived the name, Mojapur.

[5][6] Many janapadas grew up along the old Bhagirathi channel from the ancient times until around the 16th century: Kalighat, Boral, Rajpur, Harinavi, Mahinagar, Baruipur, Baharu, Jaynagar Majilpur, Chhatrabhog etc.

"Chand Sadagar, a merchant character of the Manasavijaya, reached Baruipur, from Kalighat, through the old Bhagirathi channel.

Rama Chandra Khan, the zamindar of Chhatrabhog, helped Chaitanyadeva to continue with his journey.

When Pratapaditya, the last independent Hindu king of Bengal at Jessore was defeated by the Mughal forces, the State Diwan's (Grand vizier) family and the State Priest's family were forced to flee to avoid persecution and conversion.

[8][9] The city is famous for the ancient Dhanwantary Kali Temple, believed to be very benevolent, who listens to the prayers of her devotees promptly.

It used to be a big annual festival, with hundreds of houses performing Kali Puja on the night of the Diwali, and going out on the next day in a beautifully orchestrated procession, going around the city, before the immersion or the Bisarjan.

This has been mainly due to the gradual outward immigration of people from the hamlet, the reluctancy of the younger generation, and their inability to get hold of funds considering the deteriorating economic condition of Bengal, the rise of public subscription or locally called Barowari Puja.

[10] The city was also called Half-Calcutta owing to the development it had seen before independence, with stalwarts like Sivanath Sastri and Umesh Chandra Dutta emerging.

The entire district is situated in the Ganges Delta and the southern part is covered by the Baruipur-Jaynagar Plain.

Archaeological excavations at Dhosa and Tilpi, on the bank of the Piyali River indicate the existence of human habitation around 2,000 years ago.

According to a United Nations Development Programme report, its wind and cyclone zone is very high damage risk.

Often, in April–June, the city is struck by heavy rains or dusty squalls that are followed by thunderstorms or hailstorms, bringing cooling relief from the prevailing humidity.

[19] Rains brought by the Bay of Bengal branch of the south-west summer monsoon lash Jaynagar Majilpur between June and September, supplying it with most of its annual rainfall of about 1,850 mm (73 in).

The city receives 2,528 hours of sunshine per year, with maximum sunlight exposure occurring in March.

It had a population density of 4,431 inhabitants per square kilometre (11,480/sq mi) with a sex ratio of 959 females for every 1000 males.

After the partition of India, refugees from erstwhile East Pakistan and Bangladesh had a strong impact on the development of urban areas in the periphery of Kolkata.