1.  The Figures relate to all the Provinces and states in India. They do not relate to those portions outside the British  Administrator.

   2. Burma and Aden are no longer part of India. Figures for these areas are therefore not given.

   3. Two new Provinces Orissa and Sind have been formed since the last census, Orrisa out of portions of Madras, Bihar              and Orrisa and Central Provinces. Sind was a division in Bombay at the last census. Figures for the two new provinces are given separately. Figures for Panth Piploda, Which is British territory, are also given separately.

   4. The classification and designation of the Indian states have undergone a change since the last census. The present administrative classification has been adopted for the all-India tables, and states or state groups have been arranged  alphabetically.

   For convenience of enumeration each provincial census superintendent was allotted the states within or adjoining  his province and made responsible for tabulation of the figures for these states. The figures for these states appear in the respective provincial volume. For  Rajputana and Central India Separate volumes are published. The figures for Western India in view of the restricted tabulation have however been brought within the Bombay volume.

   5. The Survey of India furnished the latest areas for all provinces and states except the Western India States and these areas have been adopted in this table. For Western  India States  the areas are those locally determined.

    The Survey of India do not take out for units smaller than districts. In provincial volumes the areas furnished by the Survey are adopted in the Imperial Tables but in the Provincial Table., where statistics are given for units smaller than the districts, the areas locally available have been adopted. There is therefore occasionally some difference between the areas given in these volumes in Imperial Table I and Provincial Table I.
   6. A town is a place of not less than 5,000 inhabitants  possessing definite urban characteristics. All municipalities and cantonments are included under towns. In some cases places with a population of less than 5,000 inhabitants have also been treated as towns. The urban population when only places with 5,000 inhabitants and over are treated as towns is 47,796,248 and the urban : rural ratio 1:7.

   7. Formerly a simplified form of schedule was used in Baluchistan tribal areas. This time the standard  enumeration  pad and standard census questionnaire were applied.

   8. This census has seen  the extension of enumeration into the trans-border areas  of the North- West Frontier Province. In the past only the population of British posts in these areas was enumerated. At this census  enumeration covered the whole of Swat and Chitral States , two of the eight tehsils of Dir State, the whole of the Malakand  protected area and Kurram tehsil in the Kurram Agency.

            For these areas the all-India  standard questionnaire was not adopted and only the following six simple questions were asked:-

            (1)  Name                (3) Sex                  (5) Civil condition

            (2)  Age                  (4) Tribe                (6)  Means of livelihood 

            A special pad was designed for enumeration. The report and tables are printed in an appendix to the North- West Frontier provincial volume.

            In portions of the trans-border areas where there was no enumeration, an estimate of the population has been made. The enumerated and the estimated population are given below:-

  9.  A separate enumeration was made during the autumn of 1940 of the Powindahs whose annual incursion over the western frontiers of India is a feature of these parts. The results of this have been published in a separate volume.

10.  With the help of the Commerce Department information regarding the number of persons employed in ships on the High Seas during the census period was obtained from the various marine officers. The total population and the population for the various provinces from which the returns were received are given below:-

11. "Madras States" in this and other tables covers the states of Pudukottai, Banganapalle and Sandur. Agencies and tribal areas in N.W.F.P. are shown in N.W.F.P. states and Agencies.