India belongs to those multilingual countries in the world, which have on their disposal a systematic and scholarly well-founded survey about the stock of their languages, pursuing it continuously and methodically. Of great importance in this field are the Allindian census, taken respectively in the first year of each decade since the end of last century. In these census tho linguistic dates are un important and extensive part. From the progress in linguistics and in society new demands spring up, which have consequences for the approach to the inclusion and representation of linguistic dates in each census and lead to appropriate changes. This paper considers some questions and problems in this connection.