41.8% 1991 4,444,000 74.5% 2001 5,952,000 33.9% Source: Census of India [10] Hinduism in the most practiced religion in Hyderabad. Shown here is the famous Birla Mandir The city's population in 2006 was estimated to be 6.7 million, while the population of the greater metropolitan area was estimated at over 8.9 million.