Regions of Nigeria
- Okpen
- Opepwe
- Okpeje
- Okpechi
- Okpeche
- Okpe
- Okpe
- Okpe
- Okpe-Olomu
- Ikpowku
- River Onwul
- Umokpara
- Okpata
- Okpatu
- Okparo
- Okpari Creek
- Okpari
- Okpare
- Okpara Waterside
- Okparantaba
- Okparakiri
- Okpara Inland
- Okpara Forest Reserve
- Okpara Coal Mine
- Okparabe
- Okpa Oboni
- Okpanam
- Okpame
- Okpamaju
- River Okpalaga
- Okpakiri
- Okpakeke
- Okpai
- River Okpagada
- Okpaele
- Okpabo
- Okpa
- Okoyong Usung Abasi
- Okovia-Ogwo
- Okoto Ajegunle
- Okoto
- Okoto
- Okosora
- Okoso
- Okosi
- River Okoseru
- Okose
- Okose
- Okorutip
- Okoru
- Okorroba
- Okorotong
- Okoro Stream
- Okoromado (I)
- Okorom
- Okoro Inyong
- Okoro Iko
- Okoroete
- Odibokiri
- Okoroba Nkum
- Okoroba
- Okoroba
- Okoro
- Okoro
- Okoro
- Okoro
- Okoro
- Okoro
- Okore Hill
- Okoran
- Okopoto-Agu
- Okopedi Itu
- Okopedi
- Okopedi
- Okopedi
- Okopedi
- Okop
- Oko Orisa
- Oko-Ode
- Oko-Oba
- Okonaovi
- Okon
- Okon
- Okon
- Okomwere
- Okomu Forest Reserve
- River Okomu
- Okomu
- Okomoko
- Okom Ita
- Okomi
- Okome
- Okomaro
- Oko-Makun
- Okum
- Okom
- Okolushe Egboro
- Okolo-Urhie
- Okolomo Hill
- Okolomade
- Okoloma
- Okoloma-Tai
- Okolom
- Okoloke
- Okoloba
- Okolo-Ade
- Okolo
- Oko Lemo
- Ajibabi-Olokuta
- Okokpon
- Okokori
- Okokomaiko
- Okokolo
- Okokokiri
- Okoko Item
- Okoko
- Okokete
- Okokengi
- Okojagu
- Oko Ito
- Oko Ita
- Oko Igbokofin
- Okohuo
- Okohohon
- Okoho
- Okohia
- Okogbele
- Okogbo
- Okofori
- Osin-Okete
- Okuejeba
- Okoeiye-Fadonugbo
- Oko-Ede
- Okodu
- Okodowo
- Okodogu
- Oko Camp
- Okobor
- Okobo Ebughu
- Okobo
- Okoboh
- Oko-Basi
- Oko-Anala
- Oko-Anala
- Oko-Amako
- Oko-Abe
- Oko
- Oko
- Oko
- Oko
- Oko
- Oko
- Oko
- Oko
- Oko
- Oko
- Okitipupa
- Okitiofa
- Okiti-Garawe
- Okiti
- Okiti
- River Okitankwo
- Okirigwe
- Okiri
- Okiri
- Okipirri
- Okitimekpo
- Okinni
- Okinbiribalo
- Okinano
- Okin
- Okikiri
- Okikiola
- Okikiade
- Okigwe
- Oki-Gbode
- Oki Gbone
- Oki-Agbie
- River Okia
- Ukya
- Oki
- Okhuokho
- River Okhuo
- Okhuo
- Okhuo
- Okhunmwum
- Okhuessan
- Okhuepen
- River Okhuaine
- Okhuaihe
- Okha
- Okha
- Okeze
- Okeyuyu
- Okeya
- Oketokun
- Oketepe-Oniyangan
- Okete
- Oke-Sunsun
- Oke-Su