NEW DELHI: Around 12 lakh households across 11 states and Union Territories have self-enumerated so far for the houselisting operations (HLO) phase of Census 2027. More than half of these households availed of the self-enumeration facility in the past four-five days.With the conclusion of the 15-day self-enumeration window on Wednesday across the Andaman and Nicobar Islands, Goa, Karnataka, Odisha, NDMC and cantonment areas of Delhi NCR, Mizoram, Sikkim and Lakshadweep, the census field operations, involving house-to-house visits by the enumerators, in these eight states/UTs will begin on Thursday.The field operations will last a month – till May 15. Given that 12 lakh households who have enumerated so far are only a minuscule percentage of the total population of the eight states, enumerator visits will be crucial to capturing the complete and accurate data on housing conditions and household amenities. The HLO phase forms an essential foundation for evidence-based planning and formulation of welfare and development programmes, a home ministry spokesperson said.The self-enumeration window is open till April 19 in Gujarat and Dadra and Nagar Haveli and Daman and Diu and till April 24 in Uttarakhand. It will begin Monday in Andhra Pradesh, Arunachal, Haryana, Chandigarh, MP and Chhattisgarh and on Friday in Bihar.