Delhi, March 19 -- With 12 states opposing a proposed exercise to update the National Population Register (NPR), this could be the first time India's decennial census exercise may face some disruption. That's because the house listing phase of the census and NPR update-although two separate exercises-will be conducted -simultaneously across the country from April 1 to September 30. With Telangana becoming the 12th state refusing to allow the NPR exercise in its current format, state assemblies representing almost half the country's population have opposed the planned door-to-door survey to collect a range of personal data.

The Telangana assembly's resolution against the Citizenship (Amendment) Act (CAA), the National Register of Citizens...