Census records for England and Wales from 1841 to 1911 are available online.
The websites are free to search, but there is a charge to view transcripts and download images of individual census entries.
Most local and county record offices hold microfilm or microfiche copies of the census returns for their own areas. Census returns can also usually be viewed at Church of Jesus Christ of Latter Day Saints' Family History Centres.
For Oxfordshire, try the )
Bicester Library also has copies along with Local (Trade) Directories which are another useful source of information on families, addresses, trades, etc.