William St, Smithtown
- William St C H Realty Corp
- 5 William St Del Buono, Elizabeth
- 7 William St Achtaz, Stephen/Anne
- 9 William St Hurley, Robert
- 15 William St Rhodes, Christina
- 18 William St Gray, Austin
- 19 William St Brennan, James/Taylor
- 20 William St Baboukis, Nikolaos
- 24 William St Senft, Vivian
- 27 William St Boll, Robert Jr
- 28 William St Napodano, Susan
- 31 William St Mayleas, Jean Jacques/Virgini
- 32 William St Demuccio, Christine
- 35 William St Reynolds, Kenneth
- 36 William St Leppla, Donald/Theresa
- 39 William St Tumbarello, Joseph/Dina
- 40 William St O'Keefe, Janet
- 43 William St Cavagnaro, Brian
- 44 William St Cavallo, Louis/Jennifer
- 47 William St Demeo, Joseph/Donna
- 48 William St Sciurca, Peter