Population Distribution and Density in India

• Population distribution is the way people are spread over an area: where they cluster and where they are thin. Population density measures that spread as a ratio of people to land.
• India’s distribution is highly uneven. Over half its people live on about a fifth of its area, while the Himalaya, the north-east hills and the Thar desert are thinly peopled.
• The pattern is the product of physical conditions, economic activity, settlement history and state policy, acting together and changing over time.

Concept and Trend of Density

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Density and Its Measures

• Arithmetic density is the number of persons per sq km of total area. It is the figure the Census reports.
  • Census 2011: 382 persons per sq km for India. At the UN’s 2025 estimate of 1.46 billion, density is now about 445.
• Arithmetic density hides the quality of land, so geographers use refined measures of density:
  • Physiological density: persons per sq km of cultivated land. With about 141 million hectares of net sown area, India had roughly 850 persons per sq km of cropland in 2011.
  • Agricultural density: agricultural population per unit of cultivated land, a measure of pressure on farmland.
  • Economic density: population relative to the economic resources of an area.
• The national average is misleading, because India’s population is not spread evenly:
  • States range from Bihar (1,106) to Arunachal Pradesh (17).
  • Union Territories range from Delhi (11,320) to Andaman and Nicobar (46).
  • Districts range from North East Delhi (36,155) to Dibang Valley in Arunachal Pradesh (about 1).

Temporal Trend, 1901–2011

• Density rose five-fold, from 77 in 1901 to 382 in 2011. It tracks the phases of population growth in India.
• 1901–21: stagnation.
  • Density rose from 77 to 82 (1911) and then fell to 81 in 1921, the only decline on record.
  • Epidemics (the 1918 influenza), famines and the First World War kept death rates as high as birth rates.
  • 1921 is the “year of the great divide”: before it, mortality checks held numbers down; after it, growth never stopped.
• 1921–51: gradual increase.
  • Density rose from 81 to 117.
  • Public health, vaccination and better food distribution cut deaths while births stayed high.
• 1951–81: rapid increase.
  • Density rose from 117 to 216 as epidemics were controlled and planned development spread.
  • Deaths fell sharply while births stayed high, the period of population explosion.
• 1981–2011: high but slowing increase.
  • Density rose from 216 to 382, adding about 57 persons per sq km in each of the last two decades.
  • The rate of increase fell with declining fertility, rising literacy and urbanisation.
• Consequence: a steadily rising man–land ratio.
  • Average operational holdings have shrunk to about 1.1 hectares (2015–16).
  • Cultivation has spread to marginal land.
  • Cities have spread over farmland.

Spatial Pattern of Distribution and Density

Concentration of Population

• India’s people are concentrated in a few large states:
  • The five most populous states, Uttar Pradesh, Maharashtra, Bihar, West Bengal and Madhya Pradesh, held about 48% of the population in 2011.
  • Uttar Pradesh alone has 16.5% of India’s people on 7.3% of its area. Bihar has 8.6% of the people on 2.9% of the area, and Kerala 2.8% on 1.2%.
  • Rajasthan, the largest state, has 10.4% of the area but 5.7% of the people. Madhya Pradesh and the Himalayan and north-eastern states also hold far less than their share of land.
• At the district level the imbalance is sharper (Census 2011, 640 districts):
  • The 246 districts with more than 500 persons per sq km cover about 22% of India’s area but hold 55% of its people.
  • The 61 districts with fewer than 100 cover 15% of the area but hold under 2% of the people.
  • 98 districts exceeded 1,000 persons per sq km, mostly in the Ganga plain, the deltas of West Bengal, Kerala and the metropolitan regions.
• The core of population is the Indo-Gangetic plain from Punjab to West Bengal, with outliers along the coastal plains and deltas of the peninsula.

Density Regions

Very High Density (above 1,000 persons per sq km)

• Bihar (1,106) and West Bengal (1,028), and the city UTs: Delhi (11,320), Chandigarh (9,258), Puducherry (2,547), Daman and Diu (2,191) and Lakshadweep (2,149).
• Bihar and West Bengal:
  • They lie on the fertile alluvium of the middle and lower Ganga and the Ganga–Brahmaputra delta, with ample rain and water and two or three crops a year.
  • Settlement here is very old.
  • High natural growth continues with little industrial absorption, so rural densities are among the highest in the world.
• West Bengal’s Hooghly belt adds a colonial industrial core around Kolkata.
• Delhi and Chandigarh are dense because they are cities: administrative and economic primacy draws large-scale in-migration.
• Small UTs such as Lakshadweep, Daman and Diu and Puducherry show the small-area effect: a modest population on very little land gives a very high density.

High Density (501–1,000)

• Kerala (860), Uttar Pradesh (829), Haryana (573), Tamil Nadu (555), Punjab (551), and Dadra and Nagar Haveli and Daman and Diu (about 975 combined).
• Uttar Pradesh: the upper Ganga plain, with fertile alluvium and dense nucleated villages.
• Punjab and Haryana:
  • Rainfall is modest, but canal and tube-well irrigation and the Green Revolution support intensive farming.
  • Haryana also draws migrants to the Delhi suburbs.
• Kerala:
  • A narrow coastal plain with heavy rain, plantation and coconut economies, and dispersed but continuous rural settlement.
  • Remittances from the Gulf add to its income.
  • It combines high density with high human development.
• Tamil Nadu: irrigated deltas (Cauvery), an industrial base and an urban network.
• The industrial UTs on the Gujarat coast grew dense through in-migration of factory workers.

Moderate Density (251–500)

• Jharkhand (414), Assam (398), Goa (394), Maharashtra (365), Tripura (350), Karnataka (319), Telangana (312), Gujarat (308), Andhra Pradesh (304), Odisha (270), and Jammu and Kashmir (about 290 on its present area).
• This broadly matches India’s average and the peninsular plateau, where farming potential is mixed.
• Within this band, density depends on resources:
  • Assam: the fertile Brahmaputra valley and tea gardens, limited by floods and hills.
  • Jharkhand and Odisha: mineral and industrial pockets in an otherwise forested, tribal plateau.
  • Maharashtra and Gujarat: large dry interiors, offset by industrial and urban corridors (Mumbai–Pune, Ahmedabad–Surat).
  • Tripura: more plain land than the other north-eastern states.

Low Density (100–250)

• Madhya Pradesh (236), Rajasthan (200), Chhattisgarh (189), Uttarakhand (189), Meghalaya (132), Manipur (128), Himachal Pradesh (123), Nagaland (119).
• Himalayan states: steep slopes, cold climate and little arable land. Valleys and the outer hills are well settled; higher ranges are nearly empty.
• Central tribal belt (Madhya Pradesh, Chhattisgarh): forested plateau, rain-fed farming and few towns.
• Rajasthan:
  • The Thar desert in the west has very low density because of aridity.
  • The east, with better rain and irrigation, is far denser.
  • The Indira Gandhi Canal is drawing settlement into the desert.
• Relief and climate show a clear negative relation with density in this band.

Very Low Density (below 100)

• Arunachal Pradesh (17), Mizoram (52), Sikkim (86), Andaman and Nicobar Islands (46) and Ladakh (about 5).
• North-eastern hill states:
  • Rugged terrain, dense forest and heavy rain.
  • Shifting cultivation and poor connectivity.
• Sikkim and Arunachal Pradesh: high altitudes and seismic and landslide hazards.
• Ladakh: a cold desert, with settlement confined to irrigated valleys.
• Andaman and Nicobar: isolation, forest reserves and a fragile island ecology.
• These areas have a low carrying capacity under present technology.

The Two Highest-Density Zones

• The middle and lower Ganga plain and delta (eastern Uttar Pradesh, Bihar, West Bengal):
  • Deep, renewed alluvium, flat land and 1,000–2,000 mm of monsoon rain allow two or three crops a year of rice, wheat, maize and pulses.
  • Settlement and state formation here go back more than two and a half millennia, so the villages are old, large and closely spaced.
  • High fertility persisted while out-migration was the main escape, so rural density kept rising with little industrial absorption.
• The Kerala coastal plain and midlands:
  • Two monsoons, a long growing season, and coconut, spice and rubber gardens support dense, dispersed homestead settlement that runs almost continuously along the coast.
  • Early literacy, health care and Gulf remittances let a dense population live well, even though fertility is now the lowest in India.

Rural and Urban Distribution

• In 2011, 68.8% of Indians lived in villages and 31.2% in towns. Rural densities on the plains are high because farming families live on the land they work.
• Urban population is concentrated in a few very large agglomerations: Greater Mumbai (18.4 million), Delhi (16.3 million) and Kolkata (about 14 million) urban agglomerations were the largest in 2011.
• City districts reach extreme densities: about 20,000 persons per sq km in Mumbai and over 24,000 in Kolkata and Chennai.
• Urban growth in 2001–11 (31.8%) far outpaced rural growth, so the map of density is being redrawn around metropolitan regions and industrial corridors.

Change after 2011

• No census has been held since 2011, but the Registrar General’s Technical Group projections (2020) show density rising fastest where fertility is still high.
  • For 2023 they imply roughly 1,350 persons per sq km in Bihar, about 1,100 in West Bengal, about 980 in Uttar Pradesh and about 920 in Kerala.
• Bihar and Uttar Pradesh are gaining share of India’s population, while the southern states, Punjab and West Bengal are losing share. The population enumeration of the next census (reference date 1 March 2027) will give the first new count.

Change in Ranking, 2001–11

• Bihar overtook West Bengal as the densest state, adding 225 persons per sq km against West Bengal’s 125.
• The largest absolute increases were in the high-growth plains states: Bihar, Uttar Pradesh (+139), West Bengal and Haryana (+95).
• Ranks changed little, because density patterns are rooted in long-term physical and historical conditions. Nagaland was the only state whose density fell (120 to 119).
• Among UTs, Delhi rose from 9,340 to 11,320 and Daman and Diu from 1,413 to 2,191, both on migration.

Factors of Uneven Distribution

• The factors influencing distribution and density are usually grouped as physical, economic, social–historical and political.
• In India, physical factors set the broad frame, while human factors explain most of the exceptions and most of the change since independence.

Physical Factors

• Relief: the decisive control.
  • The flat Indo-Gangetic plain supports intensive agriculture, cheap transport and dense villages.
  • The Himalaya, the north-east hills and the hilly parts of the peninsula have steep slopes, landslides, poor access and little arable land.
  • The general rule is: plains dense, plateaus moderate, mountains and deserts sparse.
• Climate and rainfall:
  • In a farming society, population tends to follow rainfall. Density falls from the humid east (West Bengal, Bihar) to the dry west (western Rajasthan).
  • Extreme cold (Ladakh) and extreme aridity (Thar) discourage settlement.
  • Exceptions show the limits of climate:
    • Assam and the Western Ghats receive heavy rain but have only moderate density because of floods, forests and slopes.
    • Punjab and Haryana receive modest rain but are densely settled because of irrigation.
• Soils:
  • Fertile alluvium (Ganga plain), deltaic soils (West Bengal, Cauvery, Godavari–Krishna) and the black soils of the Deccan support high agricultural output and dense populations.
  • Thin, leached laterite and desert soils support fewer people.
• Water:
  • People cluster along river valleys (Ganga, Brahmaputra, Godavari) for irrigation and domestic water.
  • Dry areas remain sparse unless canals arrive. The Indira Gandhi Canal region of Rajasthan shows how irrigation can create new concentrations.

Economic Factors

• Settled and intensive agriculture:
  • The earliest farming regions became the nuclei of dense population.
  • Intensive wet-rice and double-cropped wheat systems support very high rural densities.
• Irrigation has raised the carrying capacity of semi-arid plains (Punjab, Haryana, western Uttar Pradesh, coastal Andhra Pradesh).
• Minerals and mining:
  • The Chotanagpur plateau (Jharkhand, Odisha, Chhattisgarh) has dense pockets around Jamshedpur, Dhanbad, Rourkela and Bhilai within a thinly peopled forested plateau.
• Industrialisation: industrial regions act as growth poles, an idea associated with François Perroux (1955), drawing labour from the countryside.
  • Examples: Mumbai–Pune, Ahmedabad–Vadodara–Surat, the Hooghly belt, Bengaluru, Chennai and the Delhi region.
• Transport and communication:
  • Dense rail and road networks on the northern plain support trade and settlement.
  • Improved connectivity has raised density along corridors in the peninsula.
• Urbanisation:
  • Cities are the densest places in India, from Mumbai (about 20,000 per sq km) to Kolkata and Chennai (over 24,000).
  • The Census treats a density of at least 400 persons per sq km as one of the criteria for an urban place.
  • Urbanisation and the migration in India that feeds it are now the main forces redistributing population.

Social and Historical Factors

• Early settlement:
  • River plains and coasts were the cradles of early civilisation and kingdoms.
  • Continuous settlement for thousands of years has given them historical inertia: they stay dense even where resources are now strained.
• Colonial legacy:
  • The ports of Mumbai, Kolkata and Chennai and the railways focused on them created the first modern urban–industrial concentrations.
  • The plantation economy of Assam and the Nilgiris drew migrant labour into hill areas.
• Migration: rural–urban and interstate migration, from Bihar, Uttar Pradesh and Odisha to the western and southern cities, raises density in the metropolitan regions and slows it in the source areas.
• Social organisation:
  • Tribal areas with shifting cultivation and dispersed hamlets have low densities.
  • Caste-based nucleated villages on the plains have high ones.

Political and Policy Factors

• Planned cities and projects:
  • New capitals and steel towns created dense nodes in thinly peopled areas: Chandigarh, Bhubaneswar, Gandhinagar, Bhilai, Rourkela.
• Canal colonies and resettlement:
  • Colonial canal colonies in Punjab and post-independence schemes such as Dandakaranya (for refugees from East Pakistan) moved people into new lands.
• Partition (1947) redistributed millions across Punjab and Bengal.
• Restrictions:
  • Border areas, forest and wildlife reserves and protective land laws limit settlement in parts of the north-east and the Himalaya.
  • The Inner Line Permit in Arunachal Pradesh, Mizoram, Nagaland and Manipur is one example.

Implications of Uneven Distribution

• Pressure in the dense cores:
  • Holdings are tiny and fragmented, groundwater is over-drawn, and flood plains and wetlands are settled.
  • Disguised unemployment in farming pushes people out as migrants.
  • Bihar and eastern Uttar Pradesh combine the highest rural densities with some of the lowest incomes.
• Strain in metropolitan regions: housing shortages, slums, congestion, air and water pollution and rising land prices, as in Delhi, Mumbai and Kolkata.
• Under-use and isolation in sparse areas: high costs of roads, schools and health care per person in the Himalaya, the north-east and the island territories. Forest, mineral and hydropower resources are often worked by outside labour.
• Social composition follows the same frame:
  • Scheduled Tribes are concentrated in the sparsely peopled hills and forests of central India and the north-east.
  • Scheduled Castes are concentrated in the dense agricultural plains of Punjab, Uttar Pradesh and West Bengal.
  • The distribution of caste and tribe therefore mirrors the density map.
• Planning responses:
  • Industrial dispersal and new growth centres.
  • Satellite towns and regional plans such as the National Capital Region plan.
  • Irrigation and land development in dry areas.
  • Better connectivity for the north-east and the hills.
  • The aim is to ease pressure in the cores and raise the carrying capacity of the periphery.

Geographical Synthesis

• India’s density pattern shows the shift from environmental control to human adaptation:
  • Nature sets the limits, as in the Himalaya and the Thar.
  • Technology, irrigation and industry let people press beyond them, as in Punjab and the Indira Gandhi Canal area.
• The pattern has a core–periphery form:
  • The core: the Ganga plain, the deltas, the irrigated north-west and the urban–industrial corridors.
  • The periphery: the mountains, the deserts and the forested tribal plateau.
• Physical factors explain the old, rural pattern. Economic and urban factors increasingly explain change, as migration concentrates people in metropolitan regions.
  • John I. Clarke and Wilbur Zelinsky (1971) both stressed that, as development proceeds, economic forces and mobility outweigh the physical environment in shaping distribution.
• Over- and under-populated regions: density alone does not decide whether a region is over-populated; the balance of population and resources does.
  • Rural Bihar and eastern Uttar Pradesh, with very high density, low productivity and heavy out-migration, show signs of over-population.
  • Punjab and Kerala are dense but support their people through irrigation, remittances and services.
  • Parts of the north-east and central India have resources (forests, minerals, water) that are under-used: relative under-population in an economic sense, though not an empty land for settlers.
• The next census (enumeration reference date 1 March 2027) will show how much the post-2011 slowdown in fertility and the growth of cities have redrawn this map.