Population Distribution and Settlements
India's population for UPSC — distribution and density, growth phases, Census 2011 composition, migration streams, rural settlement types and urban definitions.
SyllabusGS I · Social geography of India — population and associated issues, distribution, migration and settlements; urbanisation
Prerequisites: Physiography of India · Agricultural Geography
The Hook: The World’s Most Populous Country
In April 2023, the United Nations Department of Economic and Social Affairs projected that India’s population would overtake China’s by the end of that month, making India the world’s most populous country. Yet India’s last completed Census was in 2011; the next one, notified in June 2025, takes 1 March 2027 as its reference date (1 October 2026 for snow-bound areas) and will also enumerate caste.
A billion-plus people are not spread evenly — Bihar is packed, Arunachal Pradesh is nearly empty. Why do people live where they do, how is the population changing, and how do they settle?
The Core Concept
Distribution and density
Population density = number of persons per square kilometre. Census 2011 put India’s density at 382 persons per sq km.
| Density pattern (Census 2011) | Examples |
|---|---|
| Highest among States | Bihar (1,106 per sq km) |
| Lowest among States | Arunachal Pradesh (17 per sq km) |
| Dense belts | The Ganga plain (Uttar Pradesh, Bihar, West Bengal), coastal plains, Kerala |
| Sparse belts | Himalayan States, the Thar desert, the hill States of the north-east, interior forested plateaus |
Factors behind the pattern:
| Type | Factor | Effect |
|---|---|---|
| Physical | Relief, climate, water, soil | Fertile, flat, well-watered alluvial plains support dense rural populations; mountains, deserts and dense forests do not |
| Economic | Industry, mining, services, transport | Urban–industrial regions (Mumbai, Kolkata, NCR, Bengaluru) attract migrants |
| Socio-cultural and historical | Early settlement, religious and administrative centres | Long-settled river valleys and pilgrimage centres |
Growth: four phases since 1901 (NCERT)
| Phase | Period | Character |
|---|---|---|
| I | 1901–1921 | Stagnant growth — high birth and death rates; epidemics and famines; the decade 1911–21 recorded a fall in population |
| II | 1921–1951 | Steady growth — falling death rates with better sanitation and health care. 1921 is called the year of the great divide |
| III | 1951–1981 | Population explosion — death rates fell sharply while birth rates stayed high |
| IV | 1981 onwards | Growth remains high but has been slowing steadily as birth rates fall |
Census 2011 recorded a decadal growth rate of about 17.7% for 2001–2011, down from about 21.5% in 1991–2001. In terms of the demographic transition model, India is in the late expanding stage: death rates are low and birth rates are falling. NFHS-5 (2019–21) reported a total fertility rate of 2.0, below the replacement level of 2.1.
Composition (Census 2011 unless stated)
| Indicator | Figure |
|---|---|
| Total population | 121.09 crore (1,210.85 million) |
| Most and least populous States | Uttar Pradesh; Sikkim |
| Sex ratio (females per 1,000 males) | 943; highest Kerala (1,084), lowest among States Haryana (879) |
| Child sex ratio (0–6 years) | 919 — lower than the overall ratio, a sign of sex-selective practices |
| Literacy rate (population aged 7+) | 74.04% (provisional figure, used by NCERT); highest Kerala, lowest Bihar |
| Scheduled Castes / Scheduled Tribes | 16.6% / 8.6% of the population |
| Religion | Hindus 79.8%, Muslims 14.2%, Christians 2.3%, Sikhs 1.7%, Buddhists 0.7%, Jains 0.4% |
| Urban population | About 31% |
| Towns | 7,935 — 4,041 statutory towns and 3,894 census towns |
| Million-plus cities / urban agglomerations | 53 |
NFHS-5 (2019–21) found 1,020 women per 1,000 men in its sample — a survey figure, not a Census figure, and the two should not be confused.
Migration
| Basis | Key points |
|---|---|
| Streams | Rural → rural, rural → urban, urban → urban, urban → rural. Rural-to-rural is the largest stream, dominated by women moving after marriage |
| Causes — push | Poverty, low farm productivity, lack of jobs, disasters, conflict |
| Causes — pull | Jobs, higher wages, education, health care, urban amenities |
| By gender | Marriage is the main reason for women’s migration; work and employment for men |
| Major destinations | Maharashtra, Delhi, Gujarat, Haryana; major sources include Uttar Pradesh and Bihar |
| Consequences | Remittances and skills (positive); overcrowding of cities, slums, ageing and feminisation of left-behind rural populations (negative) |
The Census measures migration in two ways: by place of birth and by place of last residence.
Rural settlements
| Type | Description | Where (NCERT) |
|---|---|---|
| Clustered / compact | Houses packed together; fields around | Northern plains; parts of north-east; Bundelkhand and Rajasthan (for water or defence) |
| Semi-clustered / fragmented | Cluster with segregated outlying sections | Gujarat plains, parts of Rajasthan |
| Hamleted | Village split into physically separate units (called panna, para, palli, nagla, dhani) sharing one name | Middle and lower Ganga plain, Chhattisgarh, lower Himalayan valleys |
| Dispersed / isolated | Isolated huts or small hamlets in forests, hills or farmland | Meghalaya, Uttarakhand, Himachal Pradesh, Kerala |
Patterns (shapes): linear (along roads, rivers or canals), rectangular (plains with crossroads), circular (around a lake or tank), star-like (where roads converge), T-shaped (at road junctions), double village (on both banks of a river).
Urban settlements
Census definition of a town:
| Type | Criteria |
|---|---|
| Statutory town | Any place with a municipality, corporation, cantonment board or notified town area committee |
| Census town | Population at least 5,000; at least 75% of the male main working population in non-agricultural work; density at least 400 persons per sq km |
| Urban agglomeration | A continuous urban spread — a town and its adjoining outgrowths, or two or more contiguous towns |
Functional classification of towns (examples):
| Function | Example |
|---|---|
| Administrative | Chandigarh, Bhopal |
| Industrial | Jamshedpur, Bhilai |
| Transport (ports, rail junctions) | Kandla, Kochi, Mughal Sarai |
| Commercial | Kolkata, Satna |
| Mining | Raniganj, Jharia, Digboi |
| Garrison (cantonment) | Mhow, Ambala, Babina |
| Educational | Roorkee, Varanasi, Pilani |
| Religious and cultural | Varanasi, Mathura, Ajmer, Puri |
| Tourist | Nainital, Shimla, Mussoorie |
graph LR
A[Population growth and distribution] --> B[Pressure on land in dense plains]
B --> C[Rural-to-urban migration]
C --> D[Growth of towns and urban agglomerations]
D --> E[Census towns emerge from large villages]
D --> F[Slums, infrastructure stress]
C --> G[Remittances to source regions]Memory Anchors
Growth phases: “Some Sleepy Elephants Slow” → Stagnant (1901–21) · Steady (1921–51) · Explosion (1951–81) · Slowing (1981 onwards).
Census town rule — “5-75-400”: population 5,000 · 75% of male main workers non-agricultural · density 400 per sq km.
Settlement types, compact to loose: “Cats Sit, Hens Disperse” → Clustered · Semi-clustered · Hamleted · Dispersed.
Census 2011 sex ratios: “943 overall, 919 for children — the gap is the problem.”
One-line Mains hook: “A demographic dividend is a window, not a guarantee — it pays only when the young are healthy, skilled and employed.”
For Prelims
- Census 2011 density: 382; highest Bihar (1,106), lowest Arunachal Pradesh (17).
- Sex ratio 943; child sex ratio 919; Kerala highest, Haryana lowest among States.
- 1921 — year of the great divide; 1951–81 — population explosion.
- Census town: 5,000 people, 75% male main workers in non-farm work, 400/sq km.
- Towns in 2011: 7,935 (4,041 statutory + 3,894 census towns); 53 million-plus UAs/cities.
- NFHS-5 (2019–21): TFR 2.0 (below replacement 2.1).
- Next Census reference date: 1 March 2027 (1 October 2026 for snow-bound areas).
For Mains
- Dimensions: physical (relief, climate, water); economic (agricultural productivity, industry, services); social (gender, caste, education); political (delimitation and seat allocation, inter-State migration and identity); urban (planning, slums, census towns governed as villages).
- Keywords: carrying capacity, demographic transition, demographic dividend, dependency ratio, replacement-level fertility, missing women, circular migration, distress migration, census towns, peri-urbanisation.
- Value-addition: India overtaking China (UN DESA, April 2023); Census 2011 sex ratio 943 vs child sex ratio 919; NFHS-5 TFR of 2.0; the growing number of census towns in 2011 as evidence of “hidden” urbanisation.
Common Traps
In the News
- April 2023 — UN DESA projects that India’s population will overtake China’s by the end of the month.
- June 2025 — the Census is notified with a reference date of 1 March 2027 (1 October 2026 for snow-bound areas of Ladakh, Jammu and Kashmir, Himachal Pradesh and Uttarakhand), including caste enumeration. See Population and Associated Issues.
Practice
Prelims
With reference to Census 2011, consider the following statements:
- Bihar had the highest population density among the States.
- Kerala had the highest sex ratio among the States.
- The child sex ratio (0–6 years) was higher than the overall sex ratio.
Which of the statements given above are correct?
Solution
Statements 1 and 2 are correct — Bihar’s density was 1,106 per sq km and Kerala’s sex ratio 1,084. Statement 3 is wrong — the child sex ratio (919) was lower than the overall sex ratio (943), reflecting sex-selective practices.
Answer: C
Which one of the following is not a criterion for a place to be classified as a “census town” in India?
Solution
A census town must satisfy all three demographic tests: population of at least 5,000, at least 75% of male main workers in non-agricultural work, and density of at least 400 per sq km. Having a municipal body is what makes a place a statutory town — census towns, by definition, do not have one.
Answer: A
Which Census year is known as the “year of the great divide” in India’s demographic history?
Solution
1921 marks the end of the stagnant phase (1901–1921, when the decade 1911–21 even saw a fall in population) and the start of steady growth driven by falling death rates. 1951 begins the population-explosion phase — the usual trap.
Answer: B
Mains
Explain the physical and socio-economic factors responsible for the uneven distribution of population in India.
Solution
Introduction: Census 2011 recorded an average density of 382 persons per sq km, but it ranged from 1,106 in Bihar to 17 in Arunachal Pradesh among States. The pattern reflects nature, economy and history together.
Body — physical factors:
- Relief: flat alluvial plains (Ganga plain, deltas) are dense; the Himalayas, north-eastern hills and rugged plateaus are sparse.
- Climate: the arid Thar and cold deserts of Ladakh support few people; moderate, rainy regions support many.
- Water: perennial rivers, canals and groundwater sustain dense farming populations.
- Soil: fertile alluvium and deltaic soils versus thin, rocky or sandy soils.
Body — socio-economic factors:
- Agriculture: intensive rice farming in Bengal, Bihar and Kerala supports very high rural densities.
- Industrialisation and services: Mumbai, Kolkata, Delhi, Chennai and Bengaluru attract migrants.
- Transport and connectivity: corridors and ports concentrate people.
- Mining: creates pockets of density in otherwise sparse plateaus (Chotanagpur).
- History and culture: long-settled valleys and pilgrimage centres; political capitals.
Body — implications:
- Pressure on land and water in dense plains; underuse of resources and service-delivery challenges in sparse hills.
- Regional imbalance in jobs drives inter-State migration.
Conclusion: Nature set India’s population map and the economy is redrawing it. Balanced regional development — jobs and services closer to where people live — is the policy response.
Quick Revision
| Point | One-liner |
|---|---|
| Density (2011) | 382; Bihar highest, Arunachal lowest |
| Growth 2001–11 | About 17.7% (down from about 21.5%) |
| Phases | Stagnant · Steady (1921 divide) · Explosion (1951–81) · Slowing |
| Sex ratio | 943 overall; 919 child; Kerala 1,084; Haryana 879 |
| SC / ST | 16.6% / 8.6% |
| Census town | 5,000 · 75% · 400 |
| Towns | 7,935; 53 million-plus |
| NFHS-5 | TFR 2.0 |
| Next Census | Reference date 1 March 2027 |
Key Takeaways
- Population follows fertile, flat, well-watered land first, and jobs second.
- Prelims rewards exact Census 2011 figures and definitions — always name the source and year.
- Mains asks why the pattern exists and what it means: migration, urbanisation, regional imbalance and the demographic dividend.
Related Topics
- Human and Population Geography — quick revision
- Human and Population Geography — practice questions
- Population and Associated Issues
- Urbanisation: Problems and Remedies
- Physiography of India