Bidhannagar, also known as Salt Lake City is a satellite city of Kolkata in North 24 Parganas district in the Indian state of West Bengal. It is a p…Bidhannagar, also known as Salt Lake City is a satellite city of Kolkata in North 24 Parganas district in the Indian state of West Bengal. It is a part of the area covered by Kolkata Metropolitan Development Authority. The population within city limits was 218,323 at the 2011 census, it has increased since 2001 census. After a successful extension of the city limits in June 2015, Bidhannagar's population increased to 6.7 lakhs residents. It is now the fourth-most populous city in West Bengal, after Kolkata, Howrah and Asansol.