Census of India

Topic: Population of India: Distribution, Density, Growth and Composition · NCERT: Class 12, Ch 1 "Population: Distribution, Density, Growth and Composition"; Class 12, Ch 1 "Data - Its Source and Compilation"

Meaning

The Census of India is a full count of every person in India at one fixed moment, along with their social and economic details. It is held once every 10 years (decennial). The first census was in 1872 but was non-synchronous. The first synchronous census, with the whole country counted at the same time, came in 1881 [2].

• It is India's main source of data on population size, density, literacy, workers, language, religion, SCs/STs and migration.
• Delimitation (drawing constituency boundaries), Finance Commission transfers and welfare planning all depend on it.

Explanation

How it began and grew

• Early ideas: Plans to count people appear in Kautilya's Arthashastra (321-296 BC) and in Abul Fazl's Ain-i-Akbari from Akbar's reign [2].
• 1872, the first census:
• It was non-synchronous. Different regions were counted at different times.

• The official count ran from 1865 to 1872 [2].

• 1881, the first synchronous census:

• The whole country was counted at the same time.

• A census has been held every 10 years since then [2].

• Census 2011:

• It was the 15th census, and the 7th since Independence.
• It counted 1,210 million people (about 121 crore).
• India then ranked second in the world, after China.

What it records and who runs it

• Data collected:
• number of people and density (people per sq km);
• literacy and workers (the type of work people do);
• language and religion;
• Scheduled Castes (SCs) and Scheduled Tribes (STs);

• migration (people moving from one place to another).

• Who runs it: the Registrar General and Census Commissioner of India, under the Ministry of Home Affairs.

• Legal base:
• The Census Act, 1948 and the Census Rules, 1990 [2].
• Census is a Union subject, at entry 69 of the Union List, Seventh Schedule. The Centre plans it, and States and UTs help carry it out [2].
• Section 15 of the Census Act keeps each person's data confidential. It cannot be released under RTI, used as evidence in court, or shared with any institution [2].

Census 2027: the 16th census

• Number: 16th census overall and 8th since Independence [2].
• Why it is late: It was due in 2021 but was postponed because of COVID-19 [2].
• Notified: in the Gazette of India on 16 June 2025 [2][3].
• Budget: ₹11,718.24 crore, approved by the Union Cabinet [2].
• Reference date ("Census Moment"): the exact moment the count refers to. A baby born after this moment, for example, is not counted.
• 00:00 hours, 1 March 2027 for most of India [2][3].

• 00:00 hours, 1 October 2026 for Ladakh and the snow-bound areas of Jammu & Kashmir, Himachal Pradesh and Uttarakhand. These areas are hard to reach in winter, so they are counted earlier [2].

• Administrative boundaries frozen from 1 January 2026, so district and village borders stay fixed during the count [2].

Phase	What it covers	When
I. Houselisting and Housing Census (HLO)	Housing condition; amenities such as water, toilet and electricity; household assets. It creates the frame for Phase II	April–September 2026. Each State/UT picks a 30-day window, with an optional 15-day self-enumeration period just before it [2]
II. Population Enumeration (PE)	Each person's age, sex, education, work, migration, fertility and caste	February 2027; September 2026 for snow-bound areas [2]

• First digital census [2]:
• HLO mobile app for Android and iOS. It works offline and is available in 16 regional languages. Data goes straight from the field to the server, with no paper.
• CMMS (Census Management & Monitoring System) portal: officers at sub-district, district, state and national level track progress in near real time.
• Houselisting Block Creator (HLBC): a web map that uses satellite imagery to draw houselisting blocks, so that no area is missed or counted twice.

• Self-enumeration: households fill in their own details online in 16 languages and get a Self-Enumeration ID. The enumerator checks the data during the visit.

• Caste enumeration:

• Decided by the Cabinet Committee on Political Affairs on 30 April 2025 [2].
• Until Census 2011, only SCs and STs were counted [2][3].
• It is the first full caste count since 1931, and the first since Independence [3].

Where it occurs

• Coverage: all of India, every State and UT. The Registrar General and Census Commissioner of India (Ministry of Home Affairs) runs it under the Census Act, 1948 [2].
• Two reference dates by region:
• Most of India: 1 March 2027 [2][3].

• Ladakh and the snow-bound parts of J&K, Himachal Pradesh and Uttarakhand: 1 October 2026 [2].

• Geospatial use in India: the HLBC uses satellite imagery to map houselisting blocks across the country. This is a direct use of remote sensing in counting people [2].

• Data used between two censuses:
• SRS (Sample Registration System): run by the Registrar General of India. It gives yearly birth rate, death rate, IMR, TFR and MMR [6].
• NFHS (National Family Health Survey): run by the Ministry of Health and Family Welfare, with IIPS Mumbai as the nodal agency (the lead body that runs it).

• PLFS (Periodic Labour Force Survey): run by NSO, MoSPI. It gives yearly data on jobs and unemployment.

• World context: The UN projected that India would pass mainland China in April 2023, reaching 1,425,775,850 people [4]. WPP 2024 expects India to peak at about 1.7 billion around 2064 [5].

Don't confuse with

• Sample Registration System (SRS): a sample survey run every year that records births and deaths in fixed sample villages and urban blocks [6]. The census counts everyone, but only once in 10 years. It does not give yearly IMR or TFR.
• NFHS: run by the Health Ministry with IIPS Mumbai, not by the Registrar General. It is a sample survey on health, nutrition and fertility, held about every 3–5 years.
• Non-synchronous vs synchronous census: 1872 was the first census, but regions were counted at different times (1865–1872). 1881 was the first census in which the whole country was counted at once [2].
• UN projections (WPP): UN figures such as India passing China in April 2023 are estimates [4]. India's last actual count is still Census 2011 (1,210 million).

Prelims Hooks

• First census 1872 = non-synchronous; first synchronous census 1881 [2].
• Census 2011 = 15th census (7th since Independence). Census 2027 = 16th overall and 8th since Independence [2].
• Census is a Union List subject (entry 69, Seventh Schedule) under the Census Act 1948 and Census Rules 1990. It is run by the Ministry of Home Affairs, not MoSPI [2].
• Reference date: 1 March 2027. Snow-bound Ladakh, J&K, Himachal Pradesh and Uttarakhand use 1 October 2026 [2].
• Census 2027 is the first digital census, with self-enumeration. It includes the first full caste count since 1931. Until 2011, only SCs and STs were counted [2][3].
• Trap: Section 15 of the Census Act makes individual data confidential. It cannot be obtained under RTI or used as court evidence [2].

Mains Points

• Census as the base for planning:
• It is used for delimitation, reserving seats for SCs/STs, Finance Commission transfers and targeting welfare schemes.

• Because of the gap from 2011 to 2027, policy still runs on 15-year-old figures. SRS, NFHS and PLFS fill this gap only partly.

• Digital and geospatial shift:

• Mobile apps, satellite-based block mapping (HLBC), real-time tracking (CMMS) and self-enumeration make the count faster and more complete [2].

• They also raise concerns about data security and the digital divide, especially in rural, tribal and hill areas.

• Demographic turning point and caste data:

• India is now the most populous country [4], but NFHS shows TFR 2.0 (Total Fertility Rate: the average number of children a woman has), already below the replacement level of 2.1 (the number of children per woman needed to keep population size stable).
• The population will still grow until about 2064 [5] because many young people are entering child-bearing age. This is called population momentum.
• Census 2027 data will help plan for the demographic dividend (the extra growth possible when the working-age share is high) and for the different needs of low-fertility southern states and high-fertility northern states.
• Caste data can help set reservation levels and target welfare. It also raises questions about how castes are classified and how the data is used.

Related concepts

• Census 2027
• Sample Registration System
• National Family Health Survey
• India as the most populous country

Read more

• India's population and its data sources