Thousands of households have yet to send in their census forms, officials have revealed.
One month on from census day, many of the 28-page questionnaires remain unaccounted for and non-compliance teams are preparing to knock on the doors of those responsible.
Scotland was split into a number of census zones. To date, only 95% of the forms distributed in Dundee and Angus have been returned.
Fife is better on 97% and residents in Perth and Kinross and Clackmannanshire have been more eager to comply, with 99% of their questionnaires posted.
However, that still leaves several thousand households that have not complied with instructions, potentially leaving themselves open to a £1000 fine although prosecutions are rare.
Census director Peter Scrimgeour said, “To householders who have yet to complete and return their questionnaires, I stress the importance of acting straight away, to avoid the risk of a fine.
“We sent around 200 warning letters shortly after census day and half of these households have already either returned their questionnaires or asked our helpline for a replacement. We have issued a further 200 letters in the last fortnight.
“We realise that people are busy and appreciate reminders about the census. This is the last moment to act, before members of our non-compliance team start knocking on doors.”
Glasgow has the worst record, with 9% of questionnaires still to be returned. Yet, in South Ayrshire, Dumfries and Galloway, Orkney and Shetland compliance has been virtually 100%.
The census team will have to gather information from more than 2.5 million forms sent out across Scotland. The data on topics such as population, age and health are supposed to help national and local government in planning public services.