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Urban Settlements: Census, Terms, Growth | ISC Class 12

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GeographyISC Class 12 · Urban Settlements

Urban Areas, Urban Terms, Growth Factors and Problems (ISC Class 12 Geography)

Updated 17 October 2026 · Fact-checked

The census recognises statutory towns (with a municipality or similar body) and census towns (at least 5,000 people, at least 75 per cent of male main workers in non-agricultural work and density of at least 400 per sq km). Towns fall into six size classes; 2011 had 53 million-plus agglomerations and three megacities. Urban growth is driven by industry, trade, transport, administration and migration, and brings both economic gains and problems such as slums, congestion and pollution.

Understand Urban Areas by Census, Urban Terms, Growth Factors and Problems

1. Definition of an urban area (Census 2011). Statutory towns are places with a municipality, municipal corporation, cantonment board or notified town area committee, declared by law (about 4,000 in 2011). Census towns are places without such status that satisfy all three criteria: a minimum population of 5,000; at least 75 per cent of the male main working population in non-agricultural work; and a density of at least 400 persons per sq km (about 3,900 in 2011). Everything else is rural. Census towns more than doubled between 2001 and 2011 as large villages took on urban features, and this reclassification added markedly to urban growth. In 2011 about 377 million people (31 per cent) were urban, living in about 7,900 towns.

2. Size classes. Class I: 1,00,000 and above (cities). Class II: 50,000 to 99,999. Class III: 20,000 to 49,999. Class IV: 10,000 to 19,999. Class V: 5,000 to 9,999. Class VI: under 5,000. Within Class I, a million-plus city or urban agglomeration has 10 lakh or more people (53 in 2011, against 35 in 2001), and a megacity has 1 crore or more: Greater Mumbai UA (about 18.4 million), Delhi UA (about 16.3 million) and Kolkata UA (about 14.1 million). Class I cities hold about 70 per cent of the urban population, a top-heavy structure.

3. Urban agglomeration (UA). A continuous urban spread made up of a town and its adjoining outgrowths, or of two or more physically contiguous towns with or without outgrowths. In 2011 the core town of a UA had to have at least 20,000 people. Outgrowths are villages or areas such as railway colonies or university campuses next to a town that have urban features. Delhi has spread to join Gurugram, Noida and Ghaziabad.

4. Conurbation. A large urban region formed when separate cities and towns grow outwards and merge into one continuous built-up area while keeping their own identities and administrations; Patrick Geddes coined the term. Examples: Kolkata-Howrah with the Hooghly riverside towns; Mumbai-Thane-Navi Mumbai-Kalyan.

5. Urban sprawl. The unplanned, haphazard, low-density outward spread of a city into the rural fringe, usually along highways, swallowing farmland and villages and outrunning roads, water and sewerage. Sprawl describes the process and its problems; agglomeration describes the resulting merged unit.

6. Slums. Densely built, poorly constructed, congested settlements with unhygienic conditions and no basic amenities (safe water, sanitation, drainage, electricity). The census counts a compact area of at least 300 people (about 60 to 70 households) in such conditions as a slum. About 65 million people (about 17 per cent of the urban population) lived in slums in 2011; Dharavi in Mumbai is among Asia's largest.

7. Factors in the growth of urban centres. Industrialisation (Jamshedpur, Bhilai, Bokaro, Surat); trade and ports (Mumbai, Kolkata, Chennai, Kochi); transport junctions (Mughalsarai, Itarsi); administration (Delhi, Chandigarh, Bhubaneswar, Gandhinagar); mining (Dhanbad, Singrauli); services, education and IT (Bengaluru, Hyderabad, Pune); religion, culture and tourism (Varanasi, Haridwar, Puri, hill stations such as Shimla); defence (cantonments such as Mhow and Ambala); and rural-urban migration, natural increase and reclassification. Case: Jamshedpur grew because TISCO was set up near iron ore at Noamundi, coal at Jharia, water from the Subarnarekha and Kharkai rivers and the Kolkata-Mumbai railway.

8. Problems. Housing shortage and slums; inadequate water, sanitation, drainage and waste management; traffic congestion; air, water and noise pollution, urban heat islands and flooding from blocked drains; unemployment and a growing informal sector; crime and social tension; loss of farmland and wetlands at the fringe; overloaded schools, hospitals and power.

9. Advantages. Cities are engines of economic growth, producing most of India's GDP from a minority of the people; they offer jobs and higher incomes, better education, health care and amenities, economies of scale, innovation and social change (weakening caste barriers and more opportunity for women), and markets for rural produce.

10. Remedies. Planned development (master plans, satellite towns), affordable housing and slum upgrading, mass transit, waste and water management, developing small and medium towns to ease pressure on big cities, and programmes such as the Smart Cities Mission and AMRUT.

Urban Areas by Census, Urban Terms, Growth Factors and Problems: key facts

Census town criteria
  • Population at least 5,000
  • Density at least 400 per sq km
  • At least 75% male main workers non-agricultural
Size classes
Large cities
Million-plus10 lakh+
Megacity1 crore+
201153 million-plus UAs, 3 megacities
Slum (census)
  • Compact area of 300+ people
  • about 60-70 households
  • poor housing and no basic amenities
Urban population 2011
  • 377 million
  • about 31%
  • about 65 million in slums

How to answer Urban Areas by Census, Urban Terms, Growth Factors and Problems questions

For term questions, write a precise definition with an example, and do not substitute a near term.

  1. 1Read the keyword: agglomeration (merged unit), conurbation (merged cities), sprawl (unplanned spread), slum (poor housing).
  2. 2Write the definition in one sentence.
  3. 3Add the census number or criteria where relevant.
  4. 4Give an Indian example.
  5. 5For growth factors, give the factor, an example city and one line of reasoning.

Urban Areas by Census, Urban Terms, Growth Factors and Problems in real life

The idea, met in an everyday situation. Answer the question in your own words, then compare with the model answer. The one-line hook is what to remember.

Is the large village a town?

Suppose a large village has 7,000 people, a density of 520 persons per sq km and 82 per cent of its male main workers in factories and shops, but has no municipality.

Under the census definition, how is it classified and why?

Try it first, then show the solutionSolution
  1. It has no municipality, so it is not a statutory town.
  2. It meets all three tests: at least 5,000 people, at least 400 per sq km, and at least 75 per cent male main workers in non-agricultural work.
  3. So it is a census town.

Answer: A census town, as it meets all three criteria.

Memory hook: Three tests: people, density, jobs.

Traffic jam at the city edge

Suppose a family buys a plot on former farmland near a highway at the edge of a growing city, only to find that the new colony has no sewer line and the roads are crowded.

Name the process and two problems it illustrates.

Try it first, then show the solutionSolution
  1. Unplanned, low-density spread into the rural fringe is urban sprawl.
  2. Problems: outrunning of roads, water and sewerage; loss of farmland.

Answer: Urban sprawl; services lag behind and farmland is lost.

Memory hook: Sprawl spreads without a plan.

Tricks to remember Urban Areas by Census, Urban Terms, Growth Factors and Problems

Short memory aids. Say each one aloud once, then use it on a question the same day.

  • Agglomeration is merged, sprawl is messy

    Agglomeration: a continuous urban unit. Conurbation: merged cities. Sprawl: unplanned spread.

    Use it when: Terminology.

  • 5,000 - 75 - 400

    Census town: 5,000 people, 75 per cent male non-farm workers, 400 per sq km.

    Use it when: Census criteria.

  • Lakh and crore

    Class I is 1 lakh; million-plus is 10 lakh; megacity is 1 crore.

    Use it when: Size classes.

Urban Areas by Census, Urban Terms, Growth Factors and Problems: solved examples

Ordered from board level to HOTS. Try each one before you open the solution.

Example 1: Census towns · 3 marks · Short answerBoard level

State the three criteria for a census town.

Try it first, then show the solutionSolution
  1. A minimum population of 5,000.
  2. At least 75 per cent of the male main workers in non-agricultural work.
  3. A population density of at least 400 persons per sq km.

Answer: At least 5,000 people; at least 75 per cent non-agricultural male main workers; density at least 400 per sq km.

Example 2: Megacities · 2 marks · Short answerBoard level

What is a megacity? Name the three Indian megacities of Census 2011.

Try it first, then show the solutionSolution
  1. A megacity is an urban agglomeration with 1 crore (10 million) or more people.
  2. Greater Mumbai, Delhi and Kolkata.

Answer: UA of 1 crore or more; Greater Mumbai, Delhi, Kolkata.

Example 3: Agglomeration versus sprawl · 4 marks · Long answerHarder board level

Identify the term in each case and justify: (a) Delhi has joined Gurugram, Noida and Ghaziabad into one continuous urban spread; (b) Kolkata-Howrah and the Hooghly riverside towns have merged yet keep their own administrations; (c) homes appear along a highway into farmland at a city edge without roads or sewers.

Try it first, then show the solutionSolution
  1. (a) Urban agglomeration: a continuous urban spread of a town with its outgrowths or contiguous towns.
  2. (b) Conurbation: separate cities that grow and merge into one built-up region while keeping their identities.
  3. (c) Urban sprawl: unplanned, low-density spread into the rural fringe along highways, outrunning roads and sewers.

Answer: (a) Urban agglomeration (b) conurbation (c) urban sprawl.

Example 4: Growth of Jamshedpur · 4 marks · Long answerHarder board level

Explain the factors that led to the growth of Jamshedpur.

Try it first, then show the solutionSolution
  1. TISCO was set up there, so industrialisation was the main factor.
  2. Raw materials: iron ore at Noamundi and coal at Jharia.
  3. Water from the Subarnarekha and Kharkai rivers.
  4. The Kolkata-Mumbai railway gave transport; ancillary engineering industries grew around the steel plant.

Answer: Steel industry (TISCO) with iron ore, coal, water and railway access, followed by engineering industries.

Example 5: Weigh the advantages and problems · 6 marks · Long answerHOTS / competency

Case: A planner argues that the migration of workers to cities should be stopped because of slums. (a) Give two problems of urban growth that support her. (b) Give two advantages that oppose her. (c) Suggest two measures that deal with the problems without stopping growth.

Try it first, then show the solutionSolution
  1. (a) Housing shortage and slums; traffic congestion and pollution; also overloaded water, sanitation, schools and hospitals.
  2. (b) Cities produce most of the national output and offer jobs and higher incomes; they provide better education and health care and markets for rural produce.
  3. (c) Planned development such as satellite towns and master plans; affordable housing and slum upgrading; mass transit; developing small and medium towns.

Answer: (a) Slums and congestion (b) economic growth and jobs (c) planning, affordable housing and mass transit.

Where students lose marks in Urban Areas by Census, Urban Terms, Growth Factors and Problems

The slips examiners see most often, and what to write instead.

  • Mistake: Writing urban sprawl for urban agglomeration

    Near terms are interchanged.

    Do this: Agglomeration: a continuous urban unit. Sprawl: unplanned outward spread.

    Usually costs: 1 to 2 marks.

  • Mistake: Quoting only the population criterion for a census town

    All three criteria must be met.

    Do this: Write 5,000 people, 75 per cent male non-farm workers and 400 per sq km.

    Usually costs: 1 to 2 marks.

  • Mistake: Confusing million-plus and megacity

    10 lakh and 1 crore are different limits.

    Do this: Million-plus 10 lakh; megacity 1 crore.

    Usually costs: 1 mark.

  • Mistake: Listing problems without advantages

    The question asks for both.

    Do this: Give a balanced answer with equal weight.

    Usually costs: 1 to 2 marks.

Exam tips

  • Use exact definitions for the four terms; examiners penalise near-misses.
  • Give a named city for every growth factor.
  • Use lakh and crore carefully with the class limits.
  • Balance problems and advantages in a single answer.

Practice questions on Urban Areas by Census, Urban Terms, Growth Factors and Problems

Write each answer on paper first. Open the hint only if you are stuck, and the answer only when you have finished.

  1. Q1 · 1 mark · MCQBoard level

    A town of 15,00,000 people is classified as a:
    (a) Class II town
    (b) million-plus city
    (c) megacity
    (d) Class V town

    Hint

    10 lakh or more, below 1 crore.

    Answer

    (b) million-plus city.

  2. Q2 · 2 marks · Short answerHarder board level

    Classify these towns by size class: 85,000; 12,500; 4,200; 2,40,000.

    Hint

    Use the six classes.

    Answer

    85,000: Class II; 12,500: Class IV; 4,200: Class VI; 2,40,000: Class I.

  3. Q3 · 4 marks · Long answerHarder board level

    What is a slum? State four problems faced by people in slums.

    Hint

    Poor housing, no amenities.

    Answer

    A densely built, congested settlement of poor housing with no basic amenities. Problems: lack of safe water, sanitation and drainage, electricity shortage, unhygienic conditions and disease, and insecurity.

  4. Q4 · 4 marks · Long answerHarder board level

    Explain how transport and administration influence the growth of urban centres, with two examples each.

    Hint

    Junctions and capitals.

    Answer

    Railway junctions, highways and airports attract trade and settlement (Mughalsarai, Itarsi). Capitals and district headquarters attract offices and services (Delhi, Chandigarh, Bhubaneswar, Gandhinagar).

  5. Q5 · 4 marks · Long answerHOTS / competency

    Between 2001 and 2011 the number of census towns more than doubled. (a) Explain how a village becomes a census town. (b) State one effect on the measured urban population. (c) Say why this is not the same as rural-urban migration.

    Hint

    Reclassification.

    Answer

    (a) When a large village meets all three criteria (5,000 people, 75 per cent non-agricultural male workers, 400 per sq km) it is reclassified. (b) The urban population rises on paper. (c) People did not move; the status of the place changed.

Test your recall

Answer in your head or on paper first, then open the card. Pulling an answer out of memory makes it stick far better than re-reading.

  1. 1.Minimum population of the core town of an urban agglomeration in 2011?Show answer

    20,000.

  2. 2.Who coined the term conurbation?Show answer

    Patrick Geddes.

  3. 3.Which city grew around the TISCO steel plant?Show answer

    Jamshedpur.

  4. 4.Class I town size?Show answer

    1,00,000 and above.

  5. 5.Megacities of 2011?Show answer

    Greater Mumbai, Delhi and Kolkata.

Urban Areas by Census, Urban Terms, Growth Factors and Problems: frequently asked questions

What is a statutory town?

A place with a municipality, corporation, cantonment board or notified town area committee.

Why do census towns matter for urban growth?

Reclassification of large villages added much to the measured urban population.

Which Mumbai area is among Asia's largest slums?

Dharavi.

Name a government programme for urban development.

The Smart Cities Mission and AMRUT.