The last full count, Census 2011, put the population of Chennai district at 46,46,732. That figure is still the official baseline for almost every government table about the city, even in 2026, because the next head count has not finished. The district then covered only about 175 sq km, the old city before its 2011 expansion, so the number most people quote is far smaller than the Chennai they actually live in.
Ask “how many people live in Chennai” and you will get at least three honest answers: the district, the urban agglomeration and the metropolitan area. Each is a different boundary with a different total. Here is what each one measured in 2011, where to find the tables, and what Census 2027 will change.
Three Chennais, three totals
The state’s Statistical Hand Book 2020-21, which reproduces the final Census 2011 figures, lists Chennai district at 175 sq km with 46,46,732 people: 23,35,844 men and 23,10,888 women. Every resident was counted as urban. Density worked out to 26,553 people per sq km, against a Tamil Nadu average of 555.
The wider urban agglomeration, which joins the city to its contiguous towns and suburbs, is the figure national agencies use when they compare metros. The National Crime Records Bureau, for example, still divides Chennai’s crime counts by an urban agglomeration population of 86.96 lakh from the 2011 Census, as its Crime in India 2024 volume shows. On that basis Chennai is larger than Bengaluru (84.99 lakh) and Hyderabad (77.49 lakh), though smaller than Mumbai, Delhi and Kolkata.
The planning boundary is bigger still. The CMDA’s 2024-25 policy note describes the Chennai Metropolitan Area as 1,189 sq km under its 1972 limits, and records the government’s decision to extend it to 5,904 sq km by adding parts of Kanchipuram, Tiruvallur, Chengalpattu and Ranipet districts. The Third Master Plan for 2027 to 2046 is being prepared for the 1,189 sq km area.
| Boundary | Area | Population | Year |
|---|---|---|---|
| Chennai district (old city) | 175 sq km | 46,46,732 | Census 2011 (final) |
| Chennai district (provisional count) | Same | 46,81,087 | Census 2011 (provisional) |
| Chennai urban agglomeration | Not stated in source | 86.96 lakh | Census 2011, as used by NCRB in 2026 |
| Greater Chennai Corporation (expanded) | 426 sq km | No official count published | Area per CMWSSB, 2023-24 |
| Chennai Metropolitan Area | 1,189 sq km (extension to 5,904 sq km decided) | No figure in CMDA note | 2024-25 |
Why the district grew so slowly
The provisional 2011 tables for Tamil Nadu show Chennai district growing just 7.77% between 2001 and 2011, ranking 31st of 32 districts on growth. Only The Nilgiris, which shrank, did worse. The final figures in the state handbook round the decade’s growth to 7.0%. Over the same period Tamil Nadu as a whole grew 15.6%.
The city did not stop attracting people. The old district simply had little room left, so new households settled in Tambaram, Avadi, Sholinganallur and the panchayats along the highways, which then sat outside the district. The provisional tables also recorded a 3.42% fall in the number of children aged up to six, another sign of a mature, crowded core with families moving out to cheaper suburbs.
Other 2011 markers for the district, from the same handbook:
- Sex ratio: 989 women per 1,000 men (state: 996)
- Literacy: 90.18%, second among 32 districts (state: 80.09%)
- Urban share: 100% (state: 48.40%)
The expanded Corporation has no clean Census figure
Greater Chennai Corporation absorbed suburban municipalities and panchayats after the 2011 count. Metro Water’s annual performance report gives the expanded Corporation area as 426 sq km. Because the boundary changed after the Census, there is no published Census total for today’s Corporation. Figures you see quoted for it are estimates or re-tabulations, not an official count, so check who produced them before relying on one.
Agencies that plan services make their own working assumptions. In a 2024 interview with Citizen Matters, Metro Water’s managing director spoke of supplying about 80 lakh residents, a working figure for its service area rather than a Census count.
What Census 2027 will add
The first digital Census is under way. According to DT Next, Tamil Nadu offered online self-enumeration from 17 to 31 July 2026, followed by door-to-door houselisting and housing census from 1 to 30 August 2026. The population count itself is due in February 2027 for most of the country, with 1 March 2027 as the reference date for the final figures.
For Chennai, the Greater Chennai Corporation Commissioner is the Principal Census Officer and the District Collector is the Additional Principal Census Officer. That matters because the 2027 count will be tabulated on current boundaries, which should finally give the 426 sq km Corporation and the enlarged district a proper total. Expect provisional numbers first and detailed tables much later; the 2011 provisional papers came out within months, while final tables took years.
Quick answers
What is Chennai’s official population?
Chennai district: 46,46,732 (Census 2011, final). Urban agglomeration: 86.96 lakh (Census 2011, as used by NCRB).
Is there a newer official figure?
Not yet. Census 2027 houselisting finished in August 2026 and the population count is due in February 2027.
Why do websites show 1 crore or more?
Those are usually projections for the wider metro area, not Census counts. No official count for the current boundaries exists yet.
Where can I read the Census tables?
The Census of India portal (censusindia.gov.in) and the Tamil Nadu Census directorate publish district tables; the state handbook on des.tn.gov.in summarises them.
Information checked against official sources on 18 October 2026. Fees, dates and rules can change; confirm on the linked official pages before acting.
Sources
- Statistical Hand Book of Tamil Nadu 2020-21, Area and Population (Department of Economics and Statistics, Government of Tamil Nadu)
- Census of India 2011, Provisional Population Totals Paper 2, Rural-Urban Distribution, Tamil Nadu (Directorate of Census Operations, Tamil Nadu)
- Crime in India 2024, Volume I, population of metropolitan cities (National Crime Records Bureau, via OpenCity)
- CMDA Policy Note 2024-25 (Housing and Urban Development Department, Government of Tamil Nadu)
- CMWSSB Annual Performance Report 2023-24 (Chennai Metropolitan Water Supply and Sewerage Board)
- Desalination plants will bridge Chennai’s water demand-supply gap: CMWSSB MD (Citizen Matters, May 2024)
- Tamil Nadu begins phase 1 of first digital Census (DT Next)
