2001 Census of India
The 2001 Census of India was the 14th in a series of censuses held in India every decade since 1871.
The population of India was counted as 1,028,737,436 consisting of 532,223,090 males and 496,514,346 females. Total population increased by 182,310,397, 21.5% more than the 846,427,039 people counted during the 1991 census.
Religious demographics
Hindus comprise 82.75 crore and Muslims were 13.8 crore in 2001 census. Census 2001 showed 108 faiths under the head "Other Religions and Persuasion" in India. 700,000 people did not state their religion.| Religious group | Population % 2001 |
| Hindu | 80.45% |
| Muslim | 13.4% |
| Christian | 2% |
| Sikh | 1.89% |
| Buddhist | 0.74% |
| Animist, others | 0.43% |
| Jain | 0.46% |
Language demographics
is the most widely spoken language in northern parts of India. The Indian census takes the widest possible definition of "Hindi" as a broad variety of "Hindi languages". According to 2001 Census, 53.6% of Indian population know Hindi, in which 41% of them have declared Hindi as their native language or mother tongue. English is known to 12.5% Indians in the 2001 census. The number of bilingual speakers in India is 25.50 crore, which is 24.8% of the population in 2001. India has the world's second highest number of languages, after Papua New Guinea.| Language | First language speakers | First language speakers as a percentage of total population | Second language speakers | Third language speakers | Total speakers | Total speakers as a percentage of total population |
| Hindi | 422,048,642 | 41.03 | 98,207,180 | 31,160,696 | 551,416,518 | 53.60 |
| English | 226,449 | 0.02 | 86,125,221 | 38,993,066 | 125,344,736 | 12.18 |
| Bengali | 83,369,769 | 8.10 | 6,637,222 | 1,108,088 | 91,115,079 | 8.86 |
| Telugu | 74,002,856 | 7.19 | 9,723,626 | 1,266,019 | 84,992,501 | 8.26 |
| Marathi | 71,936,894 | 6.99 | 9,546,414 | 2,701,498 | 84,184,806 | 8.18 |
| Tamil | 60,793,814 | 5.91 | 4,992,253 | 956,335 | 66,742,402 | 6.49 |
| Urdu | 51,536,111 | 5.01 | 6,535,489 | 1,007,912 | 59,079,512 | 5.74 |
| Kannada | 37,924,011 | 3.69 | 11,455,287 | 1,396,428 | 50,775,726 | 4.94 |
| Gujarati | 46,091,617 | 4.48 | 3,476,355 | 703,989 | 50,271,961 | 4.89 |
| Odia | 33,017,446 | 3.21 | 3,272,151 | 319,525 | 36,609,122 | 3.56 |
| Malayalam | 33,066,392 | 3.21 | 499,188 | 195,885 | 33,761,465 | 3.28 |
| Sanskrit | 14,135 | <0.01 | 1,234,931 | 3,742,223 | 4,991,289 | 0.49 |