| Sr. No. | Town and City | Type |
|---|
| 1 | Oaklands | Bay |
| 2 | Oakmont Crescent, Waiwhakaiho | Street/Road |
| 3 | Oakura, New Plymouth | Suburb/Town |
| 4 | Oakura River | Stream |
| 5 | Oakwood Drive, Highlands Park | Street/Road |
| 6 | Oaoiti Stream | Stream |
| 7 | Oaonui | Suburb/Town |
| 8 | Oaonui Fork Stream | Stream |
| 9 | Oaonui Stream | Stream |
| 10 | Oaonui Track | Location |
| 11 | Oapui | Hill |
| 12 | Oeo | Locality |
| 13 | Oeo Road, Auroa | Street/Road |
| 14 | Oeo Road, Awatuna | Street/Road |
| 15 | Oeo Stream | Stream |
| 16 | Ohaha Stream | Stream |
| 17 | Ohanga Road, Onaero | Street/Road |
| 18 | Ohanga Stream | Stream |
| 19 | Ohangai | Suburb/Town |
| 20 | Ohangai Pa | Site |
| 21 | Ohangai Road, Normanby | Street/Road |
| 22 | Ohangai Road, Ohangai | Street/Road |
| 23 | Ohawe | Suburb/Town |
| 24 | Ohawe Beach, Ohawe | Street/Road |
| 25 | Ohawe Road, Ohawe | Street/Road |
| 26 | Ohawe Terrace, Ohawe | Street/Road |
| 27 | Ohie-Iti Stream | Location |
| 28 | Ohie Stream | Stream |
| 29 | Ohinepaka | Stream |
| 30 | Ohio Stream | Stream |
| 31 | Ohiru Stream | Stream |
| 32 | Ohura Road, Pohokura | Street/Road |
| 33 | Ohura Road, Strathmore | Street/Road |
| 34 | Ohura Road, Tahora | Street/Road |
| 35 | Ohura Road, Te Wera | Street/Road |
| 36 | Okahu Gorge | Valley |
| 37 | Okahu Stream | Stream |
| 38 | Okahutiria Road, Waverley | Street/Road |
| 39 | Okahutiti Pa | Site |
| 40 | Okaiawa | Suburb/Town |
| 41 | Okato | Suburb/Town |
| 42 | Okato Blockhouse | Site |
| 43 | Okau | Locality |
| 44 | Okau Road, Ahititi | Street/Road |
| 45 | Okaweu Stream | Stream |
| 46 | Okehungene | Hill |
| 47 | Okirau Stream | Stream |
| 48 | Okiwa Terrace, Waiinu Beach | Street/Road |
| 49 | Okoare Lane, Ferndale | Street/Road |
| 50 | Okoki | Suburb/Town |
| 51 | Okoki Pa | Site |
| 52 | Okoki Road, Okoki | Street/Road |
| 53 | Okoki Road, Urenui | Street/Road |
| 54 | Okotuku Road, Waverley | Street/Road |
| 55 | Okura Stream | Stream |
| 56 | Okurukuru Stream | Stream |
| 57 | Old Devon Road, Sentry Hill | Street/Road |
| 58 | Old Mountain Road, Tariki | Street/Road |
| 59 | Old Mountain Road, Waiongana | Street/Road |
| 60 | Old Normanby Road, Okaiawa | Street/Road |
| 61 | Old Road, Lepperton | Street/Road |
| 62 | Old Road South, Mokoia | Street/Road |
| 63 | Old Road South, Okato | Street/Road |
| 64 | Old South Road, Okato | Street/Road |
| 65 | Oliver O'leary Way, Westown | Street/Road |
| 66 | Olsen Street, Egmont Village | Street/Road |
| 67 | Olson Street, Egmont Village | Street/Road |
| 68 | Omahine Stream | Stream |
| 69 | Omahuru Road, Okaiawa | Street/Road |
| 70 | Omaru Stream | Stream |
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