Hi Amanda,
The Dorset OPC site is "parish based". They don't have complete census transcriptions, but some of the Parish Clerks will have transcribed different censuses for "their" parishes. if you enter your search words in the search engine, it will come up with any hits, including, if applicable, entries for censuses
If you are looking at all data from a parish, rather than particular people, scroll down on the first page, and see what data has been transcribed for the parish(es) you are interested in.
I entered wedmore in the search engine and got 5 hits, including the 1861 census for Blandford with these WEDMOREs:
109; ; Bryanston Street; WEDMORE; Solomon; Head; Married; 36; Ag Lab; Durweston; RG9/1333/F15p24
109; ; Bryanston Street; WEDMORE; Susan; Wife; Married; 40; ; Blandford; RG9/1333/F15p24
109; ; Bryanston Street; WEDMORE; James; son; ; 13; Ag Lab; Blandford; RG9/1333/F15p24
109; ; Bryanston Street; WEDMORE; George; son; ; 11; Scholar; Blandford; RG9/1333/F15p24
109; ; Bryanston Street; WEDMORE; william; Son; ; 9; Scholar; Blandford; RG9/1333/F15p24
109; ; Bryanston Street; WEDMORE; Thomas; Son; ; 7; Scholar; Blandford; RG9/1333/F15p24
109; ; Bryanston Street; WEDMORE; Mary; Daughter; ; 5; Scholar; Blandford; RG9/1333/F15p24
109; /; Bryanston Street; WEDMORE; Sidney; Son; ; 4; Scholar; Blandford; RG9/1333/F15p24
They any good for you ?
I got 381 hits with "mark" !!
Hope this helps,
Bob