Indian Census & Demographics: Key Facts for Exams

Census data is a TREASURE for exam setters. They can frame dozens of questions from a single census report — highest population state, lowest literacy state, best sex ratio, population density, urban-rural split. In every government exam — RRB NTPC, SSC, Police, Group D — you'll find 1-3 questions directly from census data. And since Census 2021 was postponed due to COVID, the Census 2011 data remains the most current and most heavily tested. This means the facts haven't changed in over a decade — learn them once, use them in every exam. This article gives you every census fact that has been asked or could be asked. Treat it as your demographic data sheet.

Census History: From 1872 to 2011

Census in India is conducted under Article 246 of the Constitution (Census is in the Union List). Key historical facts: First census in India: 1872 (non-synchronous — different regions counted at different times, conducted under Lord Mayo). First synchronous (simultaneous) census: 1881 (under Lord Ripon — this is the one exams consider as the 'first proper census'). Since then, census has been conducted every 10 years without fail — 1881, 1891, 1901... all the way to 2011. Census 2011 was the 15th census of India (if counting from 1872) or the 14th (if counting from 1881 — exams usually say 15th). It was conducted under the Registrar General and Census Commissioner of India. The census motto in 2011 was 'Our Census, Our Future.' Census 2021 was supposed to happen but was indefinitely postponed due to the COVID-19 pandemic. As of 2026, it still hasn't been conducted, making Census 2011 the most current data available — and therefore, the most exam-relevant.

Census 2011: The Numbers You Must Memorize

Total Population: 121.1 crore (1.21 billion). India was the second most populous country after China, but India has since overtaken China (around 2023) to become the world's most populous nation. Sex Ratio (females per 1000 males): Overall: 943. Highest sex ratio state: Kerala (1084 — more females than males!). Lowest sex ratio state: Haryana (879). Child sex ratio (0-6 years): 914 — lower than overall, which is concerning. Literacy Rate: Overall: 73.0% (74.04% more precisely). Male literacy: 82.14%. Female literacy: 65.46%. Most literate state: Kerala (93.91%). Least literate state: Bihar (63.82%). Most literate UT: Lakshadweep (92.28%). Population by states: Most populous state: Uttar Pradesh (19.98 crore — about 16% of India's population!). Least populous state: Sikkim (6.1 lakh). Most populous UT: Delhi. Population Density (persons per sq km): Overall: 382. Highest density state: Bihar (1106). Lowest density state: Arunachal Pradesh (17). Highest density UT: Delhi (11,320). These numbers are gold — examiners pick from this exact data.

SC/ST, Urban Population & Demographic Dividend

Scheduled Castes (SC) population: 16.6% of total (about 20.14 crore). Highest SC population: UP (in absolute numbers), Punjab (in percentage — about 32%). Scheduled Tribes (ST) population: 8.6% of total (about 10.43 crore). Highest ST population: MP (in absolute numbers), Mizoram (in percentage — about 94%). Urban population: 31.2% (about 37.7 crore lived in urban areas). This means about 68.8% of India still lived in rural areas in 2011. Largest city by population: Mumbai (Greater Mumbai). Religions: Hindus 79.8%, Muslims 14.2%, Christians 2.3%, Sikhs 1.7%, Buddhists 0.7%, Jains 0.4%. Most spoken language: Hindi (about 43.6% of population). The Demographic Dividend concept: India has a young population — over 65% is below age 35. This means a large working-age population that can drive economic growth. But it's a dividend only if this population is educated and employed — otherwise it becomes a demographic disaster. National Population Policy 2000 aimed to stabilize population by 2045 and achieve replacement-level fertility (2.1 children per woman) by 2010. India achieved close to replacement level around 2021 (TFR dropped to about 2.0).

Top 10 Census Questions for Your Exam

Let me give you the 10 most frequently asked census questions — if you know these, you're prepared: 1) Most populous state? UP. 2) Least populous state? Sikkim. 3) Most literate state? Kerala. 4) Least literate state? Bihar. 5) Highest sex ratio? Kerala (1084). 6) Lowest sex ratio? Haryana (879). 7) Highest population density state? Bihar. 8) Lowest population density state? Arunachal Pradesh. 9) India's total population in 2011? 121.1 crore. 10) Overall literacy rate? 73%. Bonus questions that appear frequently: First census year (1872), first synchronous census (1881), census conducted every how many years (10), which article covers census (Article 246, Union List), and the sex ratio definition (females per 1000 males, not the other way around). Use the app's quiz section to test yourself repeatedly on these facts. The beauty of census questions is that they are 100% factual — there's no interpretation, no debate. Either you know it or you don't. And now you know it. Go revise, go practice, and go collect those marks on exam day!