Cusiosity got the better of me!! Hope you don't mind but I've a look at 1871 Wales census - here's some Benbows who were living in Trefeglwys.
Database: 1871 Wales Census
RG10/5609, Folio 44, page 2
Name Age in 1871 Birthplace Relationship Civil Parish County/Island .
Edward Benbow 54 -, - Head Trefeglwys Montgomeryshire
Sarah Jones 29 -, - Servant Trefeglwys Montgomeryshire
Name Age in 1871 Birthplace Relationship Civil Parish County/Island .
RG10/5609 Folio 45, page 3
Evan Benbow 17 -, - Servant Trefeglwys Montgomeryshire
Thomas Breese 14 -, - Nephew Trefeglwys Montgomeryshire
John Frances 52 -, - Uncle Trefeglwys Montgomeryshire
Richard Frances 3 -, - Son Trefeglwys Montgomeryshire
Susannah Frances 26 -, - Wife Trefeglwys Montgomeryshire
Thos Breese Frances 1 -, - Son Trefeglwys Montgomeryshire
William Frances 29 -, - Head Trefeglwys Montgomeryshire
William Frances 5 -, - Son Trefeglwys Montgomeryshire
John Jarman 20 -, - Servant Trefeglwys Montgomeryshire
Benjamin Jenkins 25 -, - Servant Trefeglwys Montgomeryshire
Jane Lewis 15 -, - Servant Trefeglwys Montgomeryshire
Margaret Mills 19 -, - Servant Trefeglwys Montgomeryshire
There's loads in Llanidloes too!!!!!
Name Age in 1871 Birthplace Relationship Civil Parish County/Island .
RG10/5608, folio 35, page 15
Ann Benbow 13 -, - Daughter Llanidloes Montgomeryshire
Charles Benbow 15 -, - Son Llanidloes Montgomeryshire
David Benbow 6 -, - Son Llanidloes Montgomeryshire
Elizabeth Benbow 5 -, - Daughter Llanidloes Montgomeryshire
Henry Benbow 14 -, - Son Llanidloes Montgomeryshire
John C Benbow 18 -, - Son Llanidloes Montgomeryshire
Jonathan Benbow 57 -, - Head Llanidloes Montgomeryshire
Jonathan Benbow 8 -, - Son Llanidloes Montgomeryshire
Margaret Benbow 2 -, - Daughter Llanidloes Montgomeryshire
Martha Benbow 40 -, - Wife Llanidloes Montgomeryshire
Martha Benbow 10 -, - Daughter Llanidloes Montgomeryshire
Richard Benbow 16 -, - Son Llanidloes Montgomeryshire
William Benbow 10 months -, - Son Llanidloes Montgomeryshire
Edward Morgan 39 -, - Boarder Llanidloes Montgomeryshire
Name Age in 1871 Birthplace Relationship Civil Parish County/Island .
RG10/5608, folio 9, page 11
Charles Benbow 26 -, - Son Llanidloes Montgomeryshire
Richard Benbow 66 -, - Head Llanidloes Montgomeryshire
Name Age in 1871 Birthplace Relationship Civil Parish County/Island .
RG10/5606, folio 32, page 1
Elizabeth Benbow 41 -, - Wife Llanidloes Montgomeryshire
Jane Benbow 19 -, - Daughter Llanidloes Montgomeryshire
John Benbow 48 -, - Head Llanidloes Montgomeryshire
Name Age in 1871 Birthplace Relationship Civil Parish County/Island .
RG10/5606, folio 6, page 3
John Benbow 5 -, - Son Llanidloes Montgomeryshire
Margaret Benbow 26 -, - Wife Llanidloes Montgomeryshire
Sarah Ann Benbow 8 months -, - Daughter Llanidloes Montgomeryshire
Thomas Benbow 30 -, - Head Llanidloes Montgomeryshire
Thomas Benbow 3 -, - Son Llanidloes Montgomeryshire
John Bird 18 -, - Lodger Llanidloes Montgomeryshire
William Jones 28 -, - Lodger Llanidloes Montgomeryshire
John Morgan Richards 19 -, - Lodger Llanidloes Montgomeryshire
Name Age in 1871 Birthplace Relationship Civil Parish County/Island .
RG10/5606, folio 6, page 4
Margaret Benbow 25 -, - Daughter Llanidloes Montgomeryshire
Mary Benbow 62 -, - Head Llanidloes Montgomeryshire
Name Age in 1871 Birthplace Relationship Civil Parish County/Island .
RG10/5606, folio 51, page 13
Mary Benbow 48 -, - Wife Llanidloes Montgomeryshire
Richard Benbow 50 -, - Head Llanidloes Montgomeryshire
Richd Benbow 21 -, - Son Llanidloes Montgomeryshire
Sarah A Benbow 11 -, - Daughter Llanidloes Montgomeryshire
Name Age in 1871 Birthplace Relationship Civil Parish County/Island .
RG10/5606, folio 34, page 6
Mary Benbow 40 -, - Wife Llanidloes Montgomeryshire
Oswald T Benbow 5 -, - Son Llanidloes Montgomeryshire
Thomas Benbow 36 -, - Head Llanidloes Montgomeryshire
Frances Jones 19 -, - Servant Llanidloes Montgomeryshire
Name Age in 1871 Birthplace Relationship Civil Parish County/Island .
RG10/5608, folio 7, page 8
Mrs Richard Benbow 17 -, - Adopted Son Llanidloes Montgomeryshire
Elizabeth Rees 59 -, - Head Llanidloes Montgomeryshire
Frances Rees 22 -, - Daughter Llanidloes Montgomeryshire
I think the Richard above should be a Mr!!!!
I have probably missed a few but at least these will keep you going for some time.
If you want their addresses and/or the census images let me know - but quote the RG10 etc. code then I can find them again much quicker.
I have just remembered that my Nan's friend was called Mrs Benbow, and they both lived in Foundry Terrace in Llanidloes
Jan