]Hyderabad Population Census Pop. %± 1971 1,796,000 — 1981 2,546,000 41.8% 1991 3,059,262 20.2% 2001 3,637,483 18.9% Est. 2009 4,025,335 [2] 10.7% World Gazetteer [25] Birla Mandir is a magnificent Hindu temple built entirely in white marble. The city's population in 2001 was 3.6 million and it has reached over 4.0 million