| Name | Country | Feature class | Latitude | Longitude | |
|---|---|---|---|---|---|
1951  | Petoko-Titun Petawbu,Petoko Titun,Petoko-Titun | Nigeria, Kwara State Baruten | populated place | N 8° 54′ 40'' | E 3° 11′ 17'' |
| 1952 | Permobiri Peremabiri,Permobiri,Permobri | Nigeria, Bayelsa State Southern Ijaw | populated place | N 4° 38′ 35'' | E 6° 4′ 50'' |
| 1953 | Pari-Pundu Pari Pandu,Pari Pundu,Pari-Pundu,PariPandu,PariPundu | Nigeria, Adamawa Jada | populated place | N 8° 43′ 47'' | E 12° 36′ 53'' |
| 1954 | Pankshin | Nigeria, Plateau State Pankshin | seat of a second-order administrative division population 31,516 | N 9° 19′ 31'' | E 9° 26′ 6'' |
| 1955 | Pambeguwa Anbeguwa,Pambeguwa,Panbeguwa | Nigeria, Kaduna State Kuban > Pambegua | populated place | N 10° 40′ 47'' | E 8° 16′ 39'' |
| 1956 | Uzaku Osuaku,Ozuako,Ozuaku,Uzaku | Nigeria, Abia State Ukwa West | populated place | N 4° 54′ 13'' | E 7° 10′ 59'' |
| 1957 | Ozara Otampa,Ozara,Ozara Town | Nigeria, Abia State Isuikwuato | populated place | N 5° 47′ 37'' | E 7° 31′ 25'' |
| 1958 | Ozala Ozala,Ozalla | Nigeria, Edo State Owan West | populated place | N 6° 48′ 0'' | E 6° 1′ 19'' |
| 1959 | Ozalla Ozala,Ozalla,Ozalla (1),Ozalla (2) | Nigeria, Enugu State Nkanu West | populated place | N 6° 18′ 11'' | E 7° 29′ 1'' |
1960  | Oza | Nigeria, | oilfield | N 4° 55′ 0'' | E 7° 20′ 0'' |
| 1961 | Oyoko Ojieko,Oyoko | Nigeria, Delta Ika South | populated place | N 6° 6′ 17'' | E 6° 10′ 35'' |
1962  | Oye Hill Awya Hill,Oya Hill,Oye Hill | Nigeria, Oyo State Ibarapa North | hill | N 7° 36′ 43'' | E 3° 13′ 24'' |
| 1963 | Oye-Ekiti  Oye,Oye-Ekiti | Nigeria, Ekiti State Oye | seat of a second-order administrative division | N 7° 47′ 59'' | E 5° 19′ 56'' |
| 1964 | Olepoku Olepoku,Oluapoku,Owupoku,Owupubo | Nigeria, Rivers State | populated place | N 4° 22′ 48'' | E 6° 41′ 42'' |
| 1965 | Owodokpokpor Ovbodokpokpo,Owodokpokpo,Owodokpokpor | Nigeria, Delta Isoko South | populated place | N 5° 19′ 45'' | E 6° 9′ 53'' |
| 1966 | Owode Ofaro,Oforo,Owode | Nigeria, Kwara State Ifelodun | populated place | N 8° 22′ 27'' | E 5° 5′ 31'' |
| 1967 | Owa Aledimma Owa Aledimma,Owa-Alidima | Nigeria, Delta Ika South | populated place | N 6° 1′ 36'' | E 6° 17′ 3'' |
| 1968 | Ovukwa Ovague,Ovaque,Ovukwa | Nigeria, Cross River State Obubra | populated place | N 5° 55′ 14'' | E 8° 15′ 16'' |
| 1969 | Oviriokpe Oviri,Oviri-Okpe,Oviriokpe | Nigeria, Delta Okpe | populated place | N 5° 43′ 38'' | E 5° 50′ 25'' |
| 1970 | Otuokpot Otokpotu,Otokpotua,Otuokpot | Nigeria, Bayelsa State Ogbia | populated place | N 4° 50′ 7'' | E 6° 16′ 15'' |
| 1971 | Otuma Forest Reserve | Nigeria, | forest reserve | N 7° 34′ 0'' | E 3° 26′ 0'' |
| 1972 | Otor-Udu Otor-Udu,Otudu,Udu | Nigeria, Delta Udu | seat of a second-order administrative division | N 5° 27′ 12'' | E 5° 52′ 9'' |
| 1973 | Otuan Otuan,Otwa,Otwan | Nigeria, Bayelsa State Southern Ijaw | populated place | N 4° 52′ 31'' | E 6° 7′ 24'' |
| 1974 | Otobayo Otobaye II,Otobaye Two,Otobayo | Nigeria, Edo State Orhionmwon | populated place | N 6° 7′ 23'' | E 6° 4′ 51'' |
| 1975 | Ote-Etile Awterere,Ote Etile,Ote-Etile,Oterere | Nigeria, Kwara State Asa | populated place | N 8° 23′ 2'' | E 4° 25′ 33'' |
| 1976 | Ote Awlawawle,Awterere,Ote,Oterere | Nigeria, Oyo State Ori Ire | populated place | N 8° 18′ 46'' | E 4° 23′ 12'' |
| 1977 | Otan-Ile Awton,Otan Ile,Otan-Ile,Oton | Nigeria, Osun State Obokun | populated place | N 7° 48′ 59'' | E 4° 46′ 43'' |
| 1978 | Osun Ekiti Awsun,Osan,Osun Ekiti | Nigeria, Ekiti State Moba | populated place | N 8° 1′ 0'' | E 5° 4′ 0'' |
| 1979 | Ezi-Ossu Ezi-Ossu,Ossu,Osu | Nigeria, Imo State Oguta | populated place | N 5° 38′ 53'' | E 6° 46′ 2'' |
| 1980 | Osomari Forest Reserve | Nigeria, Anambra | forest reserve | N 5° 48′ 23'' | E 6° 42′ 57'' |
| 1981 | Oso Osho,Oso | Nigeria, Ogun State Ijebu East | populated place | N 6° 42′ 30'' | E 4° 18′ 35'' |
| 1982 | Ossimilli Abara Osimili,Osimili,Ossimilli | Nigeria, Delta Ndokwa East | populated place | N 5° 58′ 13'' | E 6° 42′ 0'' |
| 1983 | Senta-Osiele Awshile,Oshiele,Osiele,Senta-Osiele | Nigeria, Ogun State Odeda | populated place | N 7° 11′ 28'' | E 3° 26′ 51'' |
1984  | Osiam Lake | Nigeria, Anambra | lake | N 5° 46′ 49'' | E 6° 47′ 27'' |
| 1985 | Oshun-Budepo Oshun,Oshun Budepo,Oshun-Budepo | Nigeria, Ogun State Ijebu North | populated place | N 7° 2′ 18'' | E 4° 4′ 17'' |
| 1986 | River Osun Awba,Awbe,Oshun,Oshun River,Osun River,River Oshun,River Osun | Nigeria, | stream | N 6° 33′ 35'' | E 4° 3′ 46'' |
| 1987 | Osasimwinoba Osasimwinoba,Osasinmoba,Osesunmoba | Nigeria, Edo State Ovia North-East | populated place | N 6° 33′ 50'' | E 5° 44′ 30'' |
| 1988 | Orudu-Olokan Ordu-Olokan,Orudu,Orudu-Olokan | Nigeria, Ogun State Ifo | populated place | N 6° 44′ 31'' | E 3° 19′ 45'' |
| 1989 | Oruba Agboyi,Oruba,Oruba Agboyi | Nigeria, Lagos Kosofe | populated place | N 6° 34′ 36'' | E 3° 24′ 35'' |
| 1990 | Orowa Orowa,Urowa | Nigeria, Edo State Esan South-East | populated place | N 6° 30′ 25'' | E 6° 32′ 24'' |
| 1991 | Oroni | Nigeria, | oilfield | N 5° 20′ 0'' | E 6° 10′ 0'' |
| 1992 | Oroghe Ologhe,Oroghe | Nigeria, Edo State Iguegben | populated place | N 6° 28′ 46'' | E 6° 14′ 8'' |
| 1993 | Orogbo-Olamodi Orogbo Lamodi,Orogbo-Lemodi,Orogbo-Olamodi | Nigeria, Ogun State Obafemi Owode | populated place | N 6° 55′ 55'' | E 3° 24′ 14'' |
| 1994 | Orita-Bodun Ajebandele,Orita,Orita-Bodun | Nigeria, Lagos Epe | populated place | N 6° 36′ 27'' | E 3° 52′ 23'' |
| 1995 | Orile-Owu Ago-Owu,Orile Owu,Orile-Owu | Nigeria, Osun State Aiyedade | populated place | N 7° 14′ 54'' | E 4° 19′ 49'' |
| 1996 | Orile-Igbein Igbein,Orile-Igbehin,Orile-Igbein | Nigeria, Ogun State Obafemi Owode | populated place | N 6° 52′ 50'' | E 3° 30′ 40'' |
| 1997 | Orho-Agbarho Agbadu,Agbarho,Orho-Agbarho | Nigeria, Delta Ughelli North | populated place | N 5° 35′ 30'' | E 5° 51′ 48'' |
| 1998 | Oregun Okori Egun,Oregun | Nigeria, Lagos Eti Osa | populated place | N 6° 29′ 11'' | E 3° 37′ 54'' |
| 1999 | Ulapata Orabuta,Oraputa,Ulapata | Nigeria, Rivers State Ahoada East | populated place | N 5° 5′ 21'' | E 6° 37′ 31'' |
| 2000 | Oroma Otu Orania-Otu,Oroma Otu,Oronia-Utu | Nigeria, Anambra Anambra West | populated place | N 6° 30′ 35'' | E 6° 51′ 40'' |
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