Census returns are amongst the most valuable records available to family researchers and so much can be learned about a family from them.
The modern decennial census started in Wales, along with the rest of Great Britain in 1801 and has been taken every 10 years since, with the exception of 1941 due to the second world war. Censuses from 1841 onward are the most useful to family historians as they list all members of households. Most records have survived with the notable exception of the Welsh and English 1931 returns which were lost in the Blitz in London during the war.
Due to privacy laws, census returns are released after 100 years have passed. This means that the 1921 census is the most recent available.
See the complete guide to find out more about the Welsh (and English) census and how to access them: