Provinces & states
First-level administrative divisions, their capitals, population and area.
| Province / state | Country | Capital | Population | Area |
|---|---|---|---|---|
| Okayama | Japan | Okayama | 1,950,750 | 7,090 |
| Okinawa | Japan | Naha | 1,273,440 | 2,255 |
| Oklahoma | United States | Oklahoma City | 3,317,091 | 181,185 |
| Olancho | Honduras | Jutigalpa | 318,000 | 24,351 |
| Olsztynskie | Poland | Olsztyn | 761,300 | 12,327 |
| Olt | Romania | Slatina | 535,000 | 5,507 |
| Oman | Oman | Muscat | 2,186,548 | 212,460 |
| Omskaya oblast | Russia | Omsk | 2,176,400 | 139,700 |
| Ongtustik Qazaqstan | Kazakstan | Shymkent | 1,987,800 | 117,300 |
| Ontario | Canada | Toronto | 10,753,573 | 1,068,582 |
| Opolskie | Poland | Opole | 1,023,800 | 8,535 |
| Oppland | Norway | Lillehammer | 181,791 | — |
| Ordu | Turkey | Ordu | 830,105 | 6,001 |
| Orebro | Sweden | Orebro | 273,608 | 8,519 |
| Oregon | United States | Salem | 3,243,487 | 251,418 |
| Orenburgskaya oblast | Russia | Orenburg | 2,228,600 | 124,000 |
| Orissa | India | Bhubaneswar | 31,659,736 | 155,707 |
| Orlovskaya oblast | Russia | Orel | 914,000 | 24,700 |
| Osaka | Japan | Osaka | 8,797,268 | 1,868 |
| Oslo | Norway | Oslo | 449,337 | — |
| Ostergotland | Sweden | Linkoping | 406,100 | 10,562 |
| Ostroleckie | Poland | Ostroleka | 400,500 | 6,498 |
| Ouest | Cameroon | Bafoussam | 1,339,800 | 13,872 |
| Oulu | Finland | Oulu | 415,000 | — |
| Overijssel | Netherlands | Zwolle | 1,050,389 | 3,337 |
| OW | Switzerland | Sarnen | 31,310 | 490 |
| Oxfordshire | United Kingdom | Oxford | 597,700 | 2,608 |
| Pahang | Malaysia | Kuantan | 1,036,724 | 35,965 |
| Pakistan | Pakistan | Islamabad | 129,275,660 | 803,940 |
| Palau | Palau | Koror | 16,952 | 458 |
| Panama | Panama | Panama City | 1,168,500 | 11,887 |
| Papua New Guinea | Papua New Guinea | Port Moresby | 4,394,537 | 461,690 |
| Para | Brazil | Belem | 5,522,783 | 1,253,164 |
| Paraguay | Paraguay | Asuncion | 5,504,146 | 406,750 |
| Paraiba | Brazil | Joao Pessoa | 3,305,562 | 56,584 |
| Parana | Brazil | Curitiba | 8,985,981 | 199,709 |
| Pasco | Peru | Cerro de Pasco | 243,366 | 25,319 |
| Pavlodar | Kazakstan | Pavlodar | 943,600 | 124,800 |
| Pays de la Loire | France | Nantes | 3,059,000 | 32,082 |
| Pecs (munic.) | Hungary | Pecs | 171,600 | 113 |
| Pembrokeshire | United Kingdom | Haverfordwest | 113,600 | 1,590 |
| Pennsylvania | United States | Harrisburg | 12,019,661 | 117,347 |
| Penzenskaya oblast | Russia | Penza | 1,562,300 | 43,200 |
| Perak | Malaysia | Ipoh | 1,880,016 | 21,005 |
| Perlis | Malaysia | Kangar | 184,070 | 795 |
| Permskaya oblast | Russia | Perm | 3,009,400 | 160,600 |
| Pernambuco | Brazil | Recife | 7,404,559 | 98,937 |
| Pest | Hungary | Budapest | 957,900 | 6,394 |