According to the census reports of 1911, 1921 and 1931, the administration was organised as follows
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The statistical dealt wit in this report cover the whole of the territory known as the Indian Empire, lying roughly between longitudes 61o to 101o E. and latitudes 18 o to 37 o N., and embracing (a) the territories directly controlled by the Government of India, generally known as British India, and (b) the Indian states, consisting of areas administered by Indian chiefs in political relations with the central Government or with one or other of the provincial Governments. Surrounding on the northern and eastern borders by the independent countries of Persia, Afghanistan, Tibet, Nepal, Bhutan, China, and Siam the frontiers of the Empire are, except in the case of part of the eastern borders of Assam and Burma, well defined. In the mountainous country on the eastern confines of these two provinces there lie sparsely inhabited areas, which have not yet been brought under regular administrative control, and in only parts of these could any enumeration of the population be undertaken or any estimate made. On the western and southern sides of India the coastline naturally affords a well-defined border.