# Demography of India > Demography of India for MBBS Community Medicine: demographic cycle, Census 2011 figures, demographic transition and dividend with exam-ready values. - Canonical URL: https://prepelephant.com/topics/mbbs/community-medicine/demography-india - Exam / course: MBBS · Subject: Community Medicine - Publisher: PrepElephant (https://prepelephant.com) — Prepared and reviewed by the PrepElephant Academic Review Team - First published: 2026-10-02 - Last updated: 2026-10-02 - How to cite: "Demography of India", PrepElephant, https://prepelephant.com/topics/mbbs/community-medicine/demography-india ## Direct answer Demography is the scientific study of human population — its size, distribution, composition and the three processes of fertility, mortality and migration. India's Census 2011, the most recent enumeration (the 2021 Census was deferred), recorded 1.21 billion people, a decadal growth of 17.7 per cent, density of 382 per sq km, sex ratio 943, child sex ratio 919 and literacy 74 per cent. India sits in the late expanding phase of the demographic transition: death rates fell decades before birth rates, producing explosive growth that is now decelerating as fertility reaches replacement (TFR 2.0, NFHS-5), opening the demographic dividend window in which working-age people outnumber dependants. ## What you must remember - **Demographic cycle stages:** high stationary (both rates high, population flat) → early expanding (death rate falls, population explodes) → late expanding (birth rate also falls) → low stationary (both low) → declining (births below deaths) — India is placed in the late expanding phase. - **Census 2011 anchors:** population 121 crore (1.21 billion); decadal growth 17.7 per cent; density 382 per sq km; sex ratio 943; child sex ratio 919; literacy 74.04 per cent (males 82.1, females 65.5); urbanisation 31.2 per cent; most populous state Uttar Pradesh, densest Bihar. - **Fertility transition:** TFR fell from about 3.4 (NFHS-3 era) to 2.0 in NFHS-5 (2019-21); replacement fertility is 2.1; only a few high-focus states still exceed it. - **Mortality transition:** IMR 28 (SRS 2020), life expectancy at birth around 70 years, with the epidemiological transition layered on top — noncommunicable diseases now dominate deaths. - **Age structure and dividend:** the working-age (15-59) share exceeds 60 per cent; the dividend is time-limited and depends on education and employment. - **Urbanisation and migration:** the 2011 census counted over 450 urban agglomerations; rural-urban migration is work-driven; census definitions of town and urban agglomeration are short-note staples. - **Population projection:** India was projected to overtake China as the world's most populous country around 2023 per UN estimates, from the Technical Group on Population Projection, not the census. ## A century compressed into one graph Plot India's birth and death rates since 1901 and the whole chapter becomes a story. Early decades show both rates high — plague, cholera and famine visible as death-rate spikes — with gentle growth. Independence-era public health (malaria control, antibiotics, immunisation) drove the death rate down steeply from the late 1940s while the birth rate barely moved: the gap between the curves is the population explosion, the early expanding phase at its most dramatic. From the 1970s the birth rate slid — female literacy, family planning, later marriage, child survival — and the gap narrowed. Today the curves nearly touch at low levels; the pyramid's base has narrowed, its middle has bulged, and India is in the late expanding phase with low stationary in sight late this century. The health-services reading of this graph is what examiners reward. The success that cut mortality created decades of youthful population needing schools, jobs and maternal services; now the ageing tail demands hypertension clinics and geriatric care — the demographic driver behind Ayushman Bharat's shift toward NCD screening. The child sex ratio of 919, falling despite a rising overall sex ratio, marks the signature of sex-selective practice, which the PCPNDT Act 1994 criminalises — demography's reminder that numbers carry policy. ## How the exam frames it Theory papers ask the demographic cycle with India's position marked, and full marks demand the reason — the death rate fell first, the birth rate lagged. One-mark and viva items pull straight from Census 2011 — density, sex ratio, child sex ratio, literacy gap, densest state — so memorise the anchor set cold. Examiners love asking why the census matters (denominators for every health rate, delimitation, welfare targeting) and what happens when it is postponed (projections age, denominators drift). The demographic dividend is the favourite essay hook: define it, give the window and the two conditions for cashing it — education and job creation — plus the corollary that the same cohort will one day swell the elderly share. Distinguish demographic from epidemiological transition in one line; conflating them is the classic slip. ## Frequently asked questions ### What is demography and what are its three core processes? The scientific study of population size, distribution and composition, governed by fertility, mortality and migration. ### What was India's population and growth rate in Census 2011? 1.21 billion people, a decadal growth of 17.7 per cent, density 382 per sq km, with a sex ratio of 943 and child sex ratio 919. ### In which stage of the demographic cycle is India? The late expanding phase — the death rate has fallen well before the birth rate, which is now also declining as fertility approaches or touches replacement level. ### What is the demographic dividend? The economic growth potential created when the working-age share of the population peaks because fertility fell, provided education and employment convert the bulge into productivity. ### Why does the child sex ratio worry demographers more than the overall sex ratio? Because it fell to 919 in 2011 despite a rising overall sex ratio, signalling ongoing sex-selective abortion and son preference, which the PCPNDT Act 1994 prohibits.