Hello Louise,
These are the John Dinsmores listed in
Griffith's Valuation of Donegal which took place in 1857.
John Dinsmore, Tobernahoory, Drumhome, Donegal
John Dinsmore, Main Street, Ballintra, Drumhome, Donegal
John Dinsmore, Ballyruddelly, Lismintan, Drumhome, Donegal
John Dinsmore, Lacklom, Drumhome, Donegal
John Dinsmore, Grahamstown, Drumhome, Donegal
John Dinsmore, Ballintra, Drumhome, Donegal
I'm not certain whether this is a listing for one guy owning a lot of properties or several guys with the same Christian name.
Christopher