National Records of Scotland (NRS)
The website of National Records of Scotland (formerly the General Register Office for Scotland) is the most comprehensive source of demographic information in Scotland. The site provides population estimates for a range of geographies (including Small Area Population Estimates – SAPE), population projections, household estimates and projections, births, deaths and other vital statistics.

Glasgow City Council
The population and housing section of the City Council’s website provide a range of useful demographic statistics for areas within the city, including population, households and dwelling estimates for Council Wards, Strategic Planning Areas (SPA), Local Housing Forum (LHF)areas and neighbourhoods. 

There are also a series of useful papers on the following:

Demographic Change in Glasgow City and Neighbourhoods

Population and Households by Ethnicity in Glasgow

2011 Census population and household estimates

Results of household estimates/projections from National Records of Scotland

Office for National Statistics (ONS)
The Office for National Statistics is the key source for a wide range of national statistics for the UK, including demographic data Click on the following link for UK population estimates.

Scottish Census Results OnLine (SCROL)
The SCROL website was created to disseminate data from the 2001 Census.  It has a range of population tables including populations broken down by age, gender, living arrangements and marital status, and these are available at a number of geographical levels from NHS (health) boards to census output areas. Additionally, the census provides the only comprehensive estimates of ethnic minority populations broken down to small areas. Household composition statistics are also available broken down into a wide range of tables.

Scottish Government Statistics
This Scottish Government website provides a range of small area statistics including information on health, education, poverty, unemployment, housing, population, crime and social / community issues at the data zone level.