Just noticed the title of your post, so probably the 1901 census.
I did an address search at FindMyPast:Looking at 1901, the numbers go from 1-16 and then 46! Looking at the actual return, this seems to be a misinterpreted annotation, not a house number.
If the family that you are interested in is William and Catherine Jones, then my interpretation is that they are at no. 7.