The history of the census is a long one, but in its most recent incarnation, the census that is performed in the UK is utilised for a number of tasks. Primarily, it acts as a way to count the population. This is what the census has always been for – a way to accurately record how many people there are in the country, who has died and who has been born. In the last century, the census has been amended to include more information, such as relationship between household members, religion and other details. However, these cannot be accessed by the public due to the 100 year rule which does not allow members of the public to see any records in the last century. Since 2011 is a census year, 1911 has just been made accessible.
The 100 year rule doesn’t really stop people from having access to many excellent resources when tracing their family trees. Censuses going back to 1841 include information on the names of people in households (after this it sadly records just numbers). From 1851 onwards, the people were not only named but their relationship to the ‘head of the house’ was also listed, meaning you can see whether or not they were related to the head of the house or worked as a servant. Censuses also recorded the ages of citizens, though these were not always accurate: the age was frequently rounded down to the nearest five years. Still, this means that ages are at least a close approximation.
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Source: http://islacampbell.articlealley.com/how-censuses-work-and-how-they-can-help-you-2198180.html