"Based on the working population, as per census 2001 data, the Insurance Regulatory and Development Authority (IRDA) has reported that the approximate total number of insurable persons in the country is 57,03,35,944," Minister of State for Finance Namo Narain Meena told the Rajya Sabha in a written reply.
http://ummid.com/news/2011/November/29.11.2011/indias_insurable_population.htm
http://ummid.com/news/2011/November/29.11.2011/indias_insurable_population.htm