Tamil Nadu on 1 August 2025 became the first state in India to launch a fully digital Houselisting and Housing Census, kicking off the initial phase of Census 2027 with a month-long door-to-door enumeration exercise across every district. The field operation, running from 1 August to 30 August, marks a historic departure from the paper-based methods that have defined Indian census-taking since independence.

Scale of the Operation

More than 1.15 lakh enumerators have been deployed across Tamil Nadu, organised under 1.2 lakh house-listing blocks spanning 1,026 administrative charges. An additional 19,000 supervisors are overseeing the process to ensure accuracy and smooth conduct throughout the state.

Enumerators will visit every household and collect responses to a 33-question schedule covering housing conditions, ownership status, construction materials, drinking water access, sanitation, electricity, cooking fuel, communication facilities, and other basic amenities.

Why This Census Is Different

For the first time in the country's census history, all field data will be captured through a dedicated mobile application, completely replacing conventional paper forms. Officials say the technology-driven approach is expected to improve data accuracy, reduce processing time, minimise transcription errors, and enable seamless real-time management of information at scale.

Notably, Tamil Nadu also introduced a self-enumeration facility ahead of the launch — a first in Indian census practice. Between 17 July and 31 July, more than 10 lakh households submitted their details online through the Census self-enumeration portal. Residents who completed the online process have been advised to keep their Self-Enumeration Identification Number ready for verification when enumerators visit.

What the Data Will Be Used For

The Houselisting and Housing Census serves as the statistical foundation for the subsequent Population Census. The data gathered will help governments at the Centre and state levels assess housing conditions, identify infrastructure gaps, and design targeted welfare programmes grounded in reliable evidence.

Officials emphasised that all information collected is protected under the Census Act, 1948, and that digital collection and processing comply with the Digital Personal Data Protection Act. Citizens' data will be used solely for statistical analysis, public policy formulation, and development planning — not for any other purpose.

Broader Significance for Census 2027

India's last census was conducted in 2011; the 2021 exercise was postponed due to the Covid-19 pandemic. Tamil Nadu's digital pilot under Census 2027 is being watched as a potential model for the national rollout. This is the first structured, large-scale test of fully digital enumeration in Indian census history, and its outcomes could shape how the rest of the country conducts its count.

Households that did not use the self-enumeration portal will be covered in full during the door-to-door survey, ensuring no household is left out of the count.