Urgent calls for more people to complete census in Scotland
Staff have visited one million homes which haven't yet completed the form.
People in Scotland who've not returned the census form are being warned they face a £1000 fine.
The deadline for filling it out is at the end of the month after being extended because of low response rates.
Census staff have carried out more than a million doorstep visits in Scotland amid the drive to improve completion rates.
Constitution Secretary Angus Robertson said: "For most people the census is not at the top of their priority list.
"By visiting people in their homes it gives us a chance to remind them of how important it is for them to complete it.
"The feedback given by the pubic on this form helps us to make the best decisions we can."
The deadline for completing the census has been extended to the end of May due to a low response rate.
National Records of Scotland (NRS), who administer the census, say that from Monday their workers will offer people extra help to complete the paperwork on the doorstep.
On Sunday the census return rate stood at 82.6%, which is 2,166,528 households.
Angus added: "I would encourage everyone to take up this offer and fill in their census as soon as possible."
A helpline is available on 0800 030 8308 which can provide a paper questionnaire or language interpretation.
Paul Lowe, NRS chief executive, added: "Thank you to those who have already completed the census. By taking part you are ensuring not just your own needs are captured but those of your family and your community too.
"This information helps to ensure that the right services are provided in the right places.
"It is used by the Scottish Government, local councils, charities and a host of other organisations who provide essential services.
"I would urge everyone who has not completed to do so immediately and before the end of May, to avoid the risk of prosecution."