Thousands more records have been added to family-history website ScotlandsPeople.
And the scanned images of the original handwritten census books detail each address from the finest hotels to cramped tenements, and from ships at sea to people in tents.
Recorded on the night of 19 July 1921, against the accommodation, everyone present is listed with details including their relationships to each other, their age, their occupation and for the first time information on orphan-hood, dependent children and workplace.
The 1921 census reveals further details of the private lives of people living through social and economic turmoil. These are people struggling to emerge from the long shadow of World War I and the Great Influenza Pandemic.
Jocelyn Grant, archivist, at National Records of Scotland said: “The release of the 1921 census allows us to trace our ancestors and notable individuals in Scotland’s history at a particular point in time.
“Recorded on the night of 19 June 1921 we can explore where a person was staying, what their home was like, who they were with, what their occupation was and who they worked for. This information makes the census a fantastic resource for researchers and family historians.”