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. The po…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. The population within city limits was 2,18,323 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.