The East London Advertiser writes that you can find the census reports for the Ripper victims at a website called Find My Past.com

Since the link doesn't seem to want to work here, I've pasted the story below:

Census details of Ripper's victims now online

15 September 2009
RIPPEROLOGISTS can now see online census records which help debunk some of the myths about his victims.

Scanned images of the 1881 census can now be viewed on www.findmypast.com.

The 1881 census gives a snapshot of the women seven years before they met their grisly end at the hands of Jack the Ripper in Whitechapel.

Two of his victims, Elizabeth Stride and Catherine Eddowes were living with their husbands seven years before the murders and 40-year-old Annie Chapman was staying with her parents before moving to be with her husband, stud groom in Berkshire.

None of them were living with their husbands at the time of their death and all of them were in their 40s, not young women in their 20s, despite the perception of popular myth that they were.