| Sr. No. | Town and City | Type |
|---|
| 1 | O Hoka Stream | Stream |
| 2 | Oak Haven | Location |
| 3 | Oakland Street, Mataura | Street/Road |
| 4 | Oatley Hill | Location |
| 5 | Oban Place, Rockdale | Street/Road |
| 6 | Oblong Hill | Hill |
| 7 | O'brien Road, Winton | Street/Road |
| 8 | Observation Creek | Stream |
| 9 | Observation Point | Point |
| 10 | Observation Rock | Hill |
| 11 | O'byrne Place, Waikiwi | Street/Road |
| 12 | O'byrne Street, Waikiwi | Street/Road |
| 13 | Occasional Cove | Stream |
| 14 | Ocean Beach, Invercargill | Suburb/Town |
| 15 | Ocean Peak | Hill |
| 16 | Odyssey Peak | Hill |
| 17 | Ogles Creek | Stream |
| 18 | Ogles Point | Point |
| 19 | Ohai | Suburb/Town |
| 20 | Ohai Clifden Highway, Birchwood | Street/Road |
| 21 | Ohai Clifden Highway, Eastern Bush | Street/Road |
| 22 | Ohai-clifden Highway, Merrivale | Street/Road |
| 23 | Ohai Clifden Highway, Orawia | Street/Road |
| 24 | O'hara Street, Appleby | Street/Road |
| 25 | O'hara Street, Strathern | Street/Road |
| 26 | Oho Creek | Stream |
| 27 | Oho Saddle | Pass |
| 28 | Oilskin Pass | Pass |
| 29 | Okaiterua Stream | Stream |
| 30 | Okaka Hut | Location |
| 31 | Okapua Creek | Stream |
| 32 | Oke Island | Island |
| 33 | Oki Street, Oreti Beach | Street/Road |
| 34 | Old Balfour Road, Balfour | Street/Road |
| 35 | Old Bluff Highway, Greenhills | Street/Road |
| 36 | Old Coach Road, Ferndale | Street/Road |
| 37 | Old Coach Road, Mataura | Street/Road |
| 38 | Old Coach Road, Waikana | Street/Road |
| 39 | Old Dunedin Road, Dacre | Street/Road |
| 40 | Old Dunedin Road, Edendale | Street/Road |
| 41 | Old Hut Creek | Stream |
| 42 | Old Main Road, Wallacetown | Street/Road |
| 43 | Old Man Rock | Stream |
| 44 | Old Mill Nugget | Island |
| 45 | Old Monowai Road, Blackmount | Street/Road |
| 46 | Old Point | Point |
| 47 | Oldham Street, Orepuki | Street/Road |
| 48 | Oldham Street, Waimatuku | Street/Road |
| 49 | O'leary Pass | Location |
| 50 | Oliver Road, Pine Bush | Street/Road |
| 51 | Olivine Falls | Waterfall |
| 52 | Olivine Hut | Location |
| 53 | Olivine River | Stream |
| 54 | Olphert Cove | Bay |
| 55 | Olsen Road, Maitland | Street/Road |
| 56 | Omaki Stream | Stream |
| 57 | Omapere Rock | Island |
| 58 | Omaui | Suburb/Town |
| 59 | Omaui Island | Island |
| 60 | Omaui Road, Greenhills | Street/Road |
| 61 | Omaui Road, Omaui | Street/Road |
| 62 | Omutu Road, Ermedale | Street/Road |
| 63 | One Tree Rock | Rock |
| 64 | O'neil Road, Motu Rimu | Street/Road |
| 65 | Ongaruanuku | Hill |
| 66 | Only Islands | Island |
| 67 | Onslow Street, Gore | Street/Road |
| 68 | Onslow Street, Newfield | Street/Road |
| 69 | Onslow Street, Rockdale | Street/Road |
| 70 | Ontario Street, East Gore | Street/Road |
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