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- 1 O Street
- 1 O. T. Weiser (firm)
- 2 O.B. Friedrich (Firm)
- 11 Oak Hall
- 10 Oak Lane
- 1 Oakdale Park
- 2 Oakford Hats (Firm)
- 2 Oakland Street
- 5 Oakland Street
- 1 Oakmont Street
- 1 Oaks
- 1 Oars
- 1 Oat, Joseph & Son Machine Shop, Copper & Brass Works
- 3 Oaths
- 2 Oatmeal
- 1 Oats
- 1 Obadiah (Biblical prophet)
- 13 Obelisks
- 1 Obituaries
- 51 Oblique views
- 1 Oboes
- 2 O'Brien Brothers
- 1 O'Bryan & Rose
- 1 Obscurity
- 1 Observation decks
- 2 Observation towers
- 1 Obstinacy
- 1 Occupations
- 50 Oceans
- 1 O'Connell, Daniel, 1775-1847
- 1 Octopuses
- 1 Odawara, Japan
- 1 Oddfellows Cemetery
- 15 Oddfellows Hall
- 1 Odes
- 6 O'Donnel Barrel Factory
- 1 Oedipus
- 2 Offers
- 79 Office buildings
- 7 Office equipment & supplies