Here are some randoms Cassidys I copied as I looked through the 17th Ward:
1892 NYS Census
ED 1 pg 2
William Cassidy, m, 38, born US, painter
Lizzie, f, 36, born US
Thomas, m, 2, born US
P19
John Cassidy, m, 52, born Ireland, cit, Boilermaker
Annie, f, 45
Maggie, f, 15 born US
Annie, f, 12, born US
Nora, f, 6, born US
ED 2 pg 6
William Cassidy, m, 26, born Ireland, A
Lizzie, f, 26, born Ireland
Thomas, m, 3, Born US
Lizzie, f, 1 born US
ED 14
Rose Cassidy, f, 38, US, Dressmaker
Sarah Cassidy, f, 36, born US, Dressmaker
Anne Cassidy, f, 32, born US, Dressmaker
Ward 17 Ed 27
457 Manhattan Ave
Michael Cassidy, 30, born Irelandm, cit, Laborer
Lizzie, f, 21, born Ireland
Kate, f, 1, born US
Ed 18
Calyer Str
Daniel Cassidt, m, 50, born Ireland, Machanist
ED 27 pg 13
Michael Cassiday, 28, born Ireland, laborer
William, m ,27, born Ireland, laborer
Mary, f, 25 born Ireland
Mamie f, 5, born US
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Cassidy, McAree, Byrnes, Patterson (Pattison), McGee, O'Brien, Rorke
(Rourke), Smith, Egan, Collins