Oakshot	Tho	Architect	Mardyke St
Oakshott	Wm	Boot maker	North Main St
O'Brien	Michael	Merchant	Mary St
O'Brien	James	Cutler	Barrack St
O'Brien		Military taylor and habit maker	George's St
O'Brien	John	Tobacconist	Barrack St
O'Brien	John	Hairdresser	George's St
O'Brien	John	Baker	South Main St
O'Brien	Michael	Baker	Barrack St
O'Callaghan	John	Livery stables	Princess St
O'Callaghan	Mrs		Hanover St
O'Callaghan	Mr Cornelius		Dean St
O'Connell	John	Boars Head Inn	Peter St
O'Connor	Sir Patrick	Merchant	South Mall
O'Connor	Jeremiah	Cabinet maker	Broad La
O'Connor	Wm esq		Dyke Parade
O'Dell	John	Stationer and patent medicine warehouse	Patrick St
O'Donoghue	Wm	Wine, spirit and grocery warehouse	Patrick St
O'Donoghue	Robt	Grocer	South Main St
O'Donoghue	Mary	Grocer	Patrick St
O'Driscol		Haberdasher	Patrick St
O'Driscol	John	Haberdasher	North Main St
O'Driscol	Tho	Attorney	Hanover St
O'Hea	John	Merchant	George's St
O'Horgan	Michael	Vintner	Bandon Rd
O'Keefe	Dan	Grocer	Broad La
O'Keefe	Arthur	Grocer	Mallow La
O'Keefe	Patrick	Dealer in spirits	North Main St
O'Keefe	David	Innkeeper	Mallow La
O'Keefe	James	Taylor	Grand Parade
O'Kelly	Dennis	Grocer	Parliament St
O'Leary	Jeremiah	Butter merchant	Bandon Rd
O'Leary	Mary	Toyshop	North Main St
O'Leary	Mr	Straw bonnet shop	Coal Quay
O'Leary	Arthur	Baker	Mallow La
O'Leary	Jeremiah	Grocer	North Main St
O'Leary	Arthur	Vintner	Duncan St
Oliver	Mr Tho		Queen's Pl
O'Mallahan	James	Wool comber	Britain St
Omen	Callahan	Ironmonger	Mallow La
O'Mullane		Merchant	Merchants Quay
O'Mulland and Dwyer		Wine merchant	Marlborough St
O'Regan	Morgan	Grocer	North Main St
O'Reilly	Jeremiah	Wholesale dealer in spirits	South Main St
O'Rooney		Patten maker	Mallow La
Osborn	Marmaduke	Hat manufacturer	North Main St
Osborn	Geo	Hat manufacturer	Grand Parade
Osborn	John	Hardwareman	Castle St
Osborn	Miss	French and English day school	Frenchurch St
Osborn	Mrs	Card maker	Mallow La
Osborn	Quintin	Attorney	Half Moon St
Osburne	Dr Henry		Ann St
O'Sullivan	Garret	Grocer and vintner	South Main St
O'Sullivan	Dan	Baker	Coal Quay