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Census, size, distribution, density and growth

Human geography of India · Part 1 / 4 · Fact-checked on 8 November 2026 · how we check

Written with AI from the sources listed at the bottom of this page, then fact-checked by a separate AI.

How the Census counts India's people and its history from 1872 to the 2027 round; the population of 2011 and India as the most populous country; why people are spread unevenly; arithmetic, physiological and agricultural density; how growth is measured and its four phases since 1901; the demographic transition and fertility (NFHS-5); and population policy from 1952 to the National Population Policy, 2000.

This chapter turns from land, water and industry to people. Human geography asks how many people a country has, where they live, how their numbers change, what the population is made of, how people move and settle, and how particular communities such as the Scheduled Tribes relate to the land. This first part deals with numbers and space: how India counts its people through the Census, how large the population is, why it is spread so unevenly, how crowded different regions are, and how fast it has grown since 1901. It ends with the demographic transition, the fall in fertility and the policies the state has used. Part 2 then looks at the make-up of the population, Part 3 at migration and cities, and Part 4 at the tribes.

The census is the complete official count of every person in the country at one point in time, with details such as age, sex, literacy, work and migration. It is entry 69 of the Union List, and it is conducted under the Census Act, 1948 by the Office of the Registrar General and Census Commissioner, India, under the Ministry of Home Affairs; the Act keeps each person's answers confidential. A first count, not taken at one time everywhere, was completed in 1872; the first synchronous census, held at one moment across the country, came in 1881, and a census followed every ten years up to 2011, the fifteenth in all and the seventh after independence. The round due in 2021 was postponed. In June 2025 the government notified a reference date of 1 March 2027, with 1 October 2026 for Ladakh and the snow-bound parts of Jammu and Kashmir, Himachal Pradesh and Uttarakhand.

Census 2011 counted about 1,210.8 million people, roughly 121 crore. With about 2.4 per cent of the world's land, India then held about 17.5 per cent of its people. Single states are as large as whole countries: Uttar Pradesh alone had about 199.8 million people, around one-sixth of India's total, followed by Maharashtra and Bihar, while Sikkim, with about 6.1 lakh, was the least populous state. The United Nations Population Division estimates that India passed China in 2023 to become the most populous country in the world. Because no census has been held since 2011, today's totals come from such projections and from sample surveys, while the 2011 count remains the latest complete official record of who lives where.

People are spread very unevenly across India. A few broad zones hold most of them: the Ganga plains from Punjab to West Bengal, and the coastal plains and river deltas of the east and west. Large areas, by contrast, are thinly peopled: the high Himalaya and Ladakh, the Thar desert of western Rajasthan, the forested hills of the north-east and parts of the central plateau. Physical conditions explain much of this pattern. Level land with fertile alluvial soil, dependable rain or irrigation and a moderate climate can feed dense farming populations. Steep slopes, severe cold, dryness, thick forest and thin soils keep numbers low, because they make farming, building and travel difficult and costly.

Physical conditions are not the whole story. Industry, mining, trade and services pull people to particular places even where nature is harsh: Mumbai, Kolkata, Chennai and Delhi grew around ports, government and jobs, and the mining towns of Chota Nagpur grew on minerals. Transport links, a long history of settlement and access to water supply, schools and hospitals add to the pull. Political events can also move people in large numbers, as when the Partition of 1947 brought millions of refugees into Punjab, Delhi and West Bengal. Suppose two districts have much the same soil: the one with a canal, a highway and a factory town will usually hold many more people. That is why a map of population in India looks so much like a map of its irrigation, roads and cities.

population density measures crowding as the number of persons per square kilometre. In 2011 India's density was 382, up from 325 in 2001. Among states, Bihar was the densest at 1,106, with West Bengal also above 1,000, while Arunachal Pradesh, at 17, was the sparsest; among union territories, the National Capital Territory of Delhi was far denser than any state, at over 11,000. This simple figure, called arithmetic density, ignores the quality of the land, so geographers also use physiological density, the total population divided by the net cultivated area, and agricultural density, the population that depends on farming divided by that same cultivated area. A dry, rocky state may look empty by arithmetic density yet be crowded in relation to the little land that can actually be farmed.

Population growth is the change in the number of people in an area between two dates, given as an absolute number or as a percentage. It has two parts. Natural increase is births minus deaths; migration adds those who move in and subtracts those who move out. For India as a whole, natural increase accounts for almost all of the change, but for one state or city migration can matter as much. The Census reports decadal growth, the percentage change over ten years, and an average annual rate is also worked out. Growth can be negative when deaths and departures outnumber births and arrivals, as happened in India in 1911–21. Between 2001 and 2011 the population grew by about 17.7 per cent, down from about 21.5 per cent in 1991–2001, the steepest fall between two decades since independence.

Since 1901 India's growth has passed through four phases. From 1901 to 1921 numbers barely moved: famines, epidemics and the influenza pandemic of 1918 kept death rates about as high as birth rates, and the population actually fell in 1911–21. For this reason 1921 is called the year of the great divide. From 1921 to 1951 growth was steady, as better sanitation, control of some diseases and improved food distribution lowered the death rate. From 1951 to 1981 the population grew fast, a phase often called the population explosion: death rates dropped quickly with medicine and development while birth rates stayed high, and 1961–71 recorded the highest decadal growth, about 24.8 per cent. Since 1981 growth has stayed high but has slowed steadily as birth rates have fallen.

These phases fit the demographic transition model, which describes how a society moves from high birth and death rates to low ones. In the first stage both rates are high and growth is slow; in the second, death rates fall while birth rates stay high, so growth speeds up; in the third, birth rates fall as well and growth slows; in the fourth both are low and numbers are close to stable. India went through the second stage after 1951 and is now well into the third. Between censuses, the Registrar General's Sample Registration System tracks birth and death rates every year. The main measure of fertility is the total fertility rate, the average number of children a woman would have in her lifetime at current rates; about 2.1 is the replacement level. NFHS-5 (2019–21) put India's rate at 2.0, with Bihar the highest at about 3.0 and Sikkim the lowest at about 1.1. Even below replacement, numbers keep rising for some decades because so many Indians are young.

India was the first country to start a national family planning programme, in 1952. The 42nd Amendment of 1976 added 'population control and family planning' to the Concurrent List as entry 20A, so both the Union and the states can make laws on it. The same amendment froze the share of Lok Sabha seats among states, and the number of seats in each state assembly, on the basis of the 1971 census until the first census after 2000, so that states which slowed their growth would not lose seats; the 84th Amendment of 2001 extended the freeze until the first census taken after 2026. The National Population Policy, 2000 set an immediate goal of meeting the unmet need for contraception and health care, a medium-term goal of bringing the total fertility rate to replacement level by 2010, and a long-term goal of a stable population by 2045, and a National Commission on Population was formed to oversee it.

The pieces of this part fit together. The Census supplies the numbers; distribution and density show where people live and why; growth and its four phases show how the total reached its present size; and the demographic transition explains why growth is now slowing, though unevenly, with several northern states behind the south. These differences reach well beyond geography: they shape the demand for jobs, schools and health care, and, through the freeze on seats, even the balance of representation in Parliament. Part 2 looks inside the totals at how the population is made up: by sex, age, literacy, work, language and religion.

Exam traps

• The first count was completed in 1872 but was NOT synchronous; the first SYNCHRONOUS census was in 1881. Census 2011 was the 15th in all and the 7th after independence.
• The census is in the UNION List (entry 69); 'population control and family planning' is in the CONCURRENT List (entry 20A, added by the 42nd Amendment, 1976).
• India's population shrank in just one census decade, 1911–21; the year ending it, 1921, is therefore called the 'year of the great divide'.
• The HIGHEST decadal growth came in 1961–71 (about 24.8 per cent), not in 1951–61 or 1971–81.
• Uttar Pradesh is the most POPULOUS state, but Bihar (1,106 in 2011) is the DENSEST; Arunachal Pradesh (17) is the sparsest; Delhi is denser than any state.
• PHYSIOLOGICAL and AGRICULTURAL density both divide by net cultivated area. What changes is the numerator: total population in the physiological measure, farming population alone in the agricultural one.
• Replacement-level TFR is about 2.1; NFHS-5 (2019–21) gave India 2.0, yet the population keeps growing for a while because the population is young.
• NPP 2000: TFR to replacement by 2010 (medium term), stable population by 2045 (long term). The seat freeze on the 1971 census came with the 42nd Amendment and was extended by the 84th to the first census after 2026.

Recap

• Census: Union List entry 69; Census Act 1948; Registrar General and Census Commissioner (MHA); 1872 first count, 1881 first synchronous; 2011 the 15th, 7th after independence; next reference date 1 March 2027.
• 2011: about 1,210.8 million; 2.4% of world area, about 17.5% of world population; UP most populous, Sikkim least; India most populous country (UN, 2023).
• Dense: Ganga plains, coastal plains and deltas; sparse: high Himalaya, Ladakh, Thar, north-eastern hills; causes physical, economic, social and political.
• Density 382 (2011), 325 (2001); Bihar 1,106 highest, Arunachal 17 lowest, Delhi over 11,000; arithmetic, physiological and agricultural density.
• Growth = natural increase + net migration; 2001–11 about 17.7%, down from about 21.5%.
• Phases: 1901–21 stagnant (1921 great divide), 1921–51 steady, 1951–81 explosion (peak 1961–71, about 24.8%), since 1981 high but slowing.
• Demographic transition: India well into stage 3; SRS tracks rates; TFR 2.0 (NFHS-5), replacement 2.1; Bihar about 3.0, Sikkim about 1.1.
• Policy: family planning 1952; entry 20A Concurrent List (42nd, 1976); seat freeze (42nd, extended by 84th); NPP 2000: replacement by 2010, stable by 2045.

Practice questions

Sources

• Constitution of India: Seventh Schedule, List I entry 69 (census) and List III entry 20A (population control and family planning, inserted by the 42nd Amendment, 1976); provisos to Articles 82 and 170 as amended by the 42nd (1976) and 84th (2001) Amendments — https://legislative.gov.in/constitution-of-india
• The Census Act, 1948; Gazette notification of the Ministry of Home Affairs on the next census (June 2025) — https://www.indiacode.nic.in
• Office of the Registrar General and Census Commissioner, India: Census of India 2011, primary census abstract and population totals; history of the Indian census; Sample Registration System — https://censusindia.gov.in
• Ministry of Health and Family Welfare: National Family Health Survey (NFHS-5), 2019–21, India and state fact sheets; National Population Policy, 2000 — https://mohfw.gov.in
• United Nations, Department of Economic and Social Affairs, Population Division: World Population Prospects and the April 2023 note on India becoming the most populous country — https://population.un.org/wpp