I can see many possibles within a slightly larger area so hoping something here looks ok to you.
1841 Cross, Bryngwyn, Radnorshire H0107/1456/2 folio 6 pg 7
James Griffiths 59 ag lab
Ann 50
Ann 8
Jhon(sic) 1
all born in county
1851 Cross H0107/2491 folio 196 pg 12
James Griffiths head widower 69 farm labourer
James Mainwaring son in law 34 receiving weekly pay blind
Mary Mainwaring dau 33
William gson 7
Sarah gdau 4
James gson 1
Ann Griffiths dau 20 house servant
all born Bryngwyn
1841 Moity, Llowes, Radnorshire H0107/1456/10 folio 8 pg 11
James Griffiths 67 not born in county
Ann 59 born in county
1841 Blackoak, Llanbedr Painscastle H0107/1456/6 folio 4 pg 2
Anne Griffiths 60 independent
James 25
Henry 22
Maryanne 20
David 15
Thomas ? 5 visitor crossed out ( not sure what his surname is, Griffiths might be dittoed, but it just looks like a squiggle and he is a separate household )
all born county apart from poor little Thomas
1851 Dyffryn Fawr, H0107/2491 folio 172 pg 5
Henry Griffiths head unm 35 drover b. Painscastle
Anne 70 retired widow b. Bryngwyn
plus others different surnames
1841 Cwm Tither(?), Hay H0107/1370/11 folio 6 pg 23
Ann Griffiths 60 not born in county
1841 Llyswen village H10107/1370/20 folio 5 pg 5
James Griffiths 45 ag lab
Ann 15
both born in county
Mary Jones 35 fs not born in county
Bladawern, Heyop H0107/1455/5 folio 11 pg 5
James Griffiths 55 weaver
Charlotte 30
Mary 20
James and mary both born in county, Charlotte not.
same address in 1851 H0107/2492 folio 139 pg 2
James Griffiths head 64 weaver b. Heyop
1851 High St, Presteigne Ho107/2492 folio 458 pg 7
Ann Griffiths head widow 71 annuitant b. Beguildy(?)
William son unm 41 draper b. Presteigne
Elizabeth dau unm 28 b. Presteigne
Ann gdau 2 b. Presteigne
Jane Griffiths visitor 73 laundress b. Brecon, Llanworthey
William Wilson visitor 33 tanner b. Durham, Tweedmouth(?)
Thomas Rowlands visitor 39 carpenter b. Pembridge, Hereford