The average household size in Scotland is now 2.12 people, down from 2.27 in 2001, according to figures published by National Records of Scotland (NRS).
City of Edinburgh and Glasgow City are the main exceptions to this trend.
From 2008 to 2021, the average household size in these two council areas increased by just over 4%.
Households consisting of only one person are the most common type in Scotland.
The latest figures also show that the total number of households in Scotland reached 2.53 million in 2021.
This was an increase of 334,300 (15%) since 2001.
The number of households has increased in every council area over the last 20 years.
Orkney Islands (29%), East Lothian (27%) and Aberdeenshire (25%) had the biggest relative increases.
The figures show there were 2.67 million dwellings in Scotland in 2021.
88,300 (3%) of these were empty.
These included new homes yet to be occupied and dwellings awaiting repair or demolition.
A total of 24,000 (1%) dwellings were second homes.
Remote rural areas generally have higher proportions of empty and second homes than urban areas.
Sandy Taylor, Head of Household Statistics said:
“These latest statistics show a continuation of the trends in the number and type of households that we have seen over the last twenty years.
“The growth in the number of households is partly due to an increase in the population but it is also because people are increasingly living alone or with fewer other people.”
