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- Ordination14
- Ophel Hill11
- Our Lady of the Lake Catholic Church, (Lake Oswego, OR)11
- Orb10
- Orthodox crosses9
- Old South Church (Boston, Mass.)7
- Ox6
- October4
- Oxyrhynchite Nome4
- Obadiah (Biblical prophet)3
- Old South Congregational Church (South Weymouth, Weymouth, Mass.)3
- Oldcastle, John, Sir, -14173
- Olive oil presses3
- Osiris (Egyptian deity)3
- Ovens3
- Overpopulation3
- Oaths2
- Old South Congregational Church (Farmington, Me.)2
- Old South Union Congregational Church (Weymouth, Mass.)2
- Old West Church (Calais, Vt.)2