Try the 1841 Tithe Map at the National Library for Wales and do a search for the general
I take it your talking about Llanfihangel-y-Creuddyn, near Aberystwyth. If you can't
find the exact place name on the Apportionment, you should be able to see the route of the
one taking the Census on the actual map.
GEDmatch kit no: A585504