sentences:  See also – List of West Bengal districts ranked by literacy rate
  
  As per census definition, mother-tongue is the language spoken in childhood by the person’s mother to the person.As a mother-tongue, Bengali has decreased its share from 91.3% of the population of North Twenty Four Parganas district in 1961 to 87.9% in 2001, Hindi has increased its share from 5.0% in 1961 to 8.3% in 2001, Urdu has increased its share from 2.0% in 1961 to 2.5% in 2001.Other mother-tongues spoken in 2001 were Odiya (0.4%), Telugu (0.2%), Santhali (0.1%), Nepali (0.1%), Bhojpuri (0.1%) and Sadan/ Sadri (0.1%).