STATES

States that start with O

41 states starting with the letter O — each with origin, classification, and notes.

Filter:

If you've been searching for states that start with O, you'll find 41 detailed states below. We're not interested in giving you only a list of names — every entry on this page links to a full profile with the kind of detail you'd actually want to know.

For states, that means country, capital, region within country, population, area, and official languages.

Table of contents 41 entries
Đồng Nai ProvinceĐồng Tháp ProvinceŁódź VoivodeshipOaxaca
ObwaldenOccidental MindoroOccitanieOdesa Oblast
OdishaOffalyOgunOhio
ŌitaOkayamaOkinawaOklahoma
Olomouc RegionOlt CountyOmsk OblastOndo
OntarioOpole VoivodeshipOran ProvinceOrdu
Örebro CountyOregonOrenburg OblastOriental (Morocco)
Oriental MindoroOromia RegionOryol OblastOsaka Prefecture
Oslo (County)OsmaniyeÖstergötland CountyOstrobothnia (Region)
OsunOuargla ProvinceOum El Bouaghi ProvinceOverijssel
Oyo

List of States That Start With O

    1

    Đồng Nai Province

    Đồng Nai Province is a province or municipality of Vietnam, with its capital at Biên Hòa.

    2

    Đồng Tháp Province

    Đồng Tháp Province is a province or municipality of Vietnam, with its capital at Cao Lãnh.

    3

    Łódź Voivodeship

    Łódź Voivodeship is a voivodeship of Poland, with its capital at Łódź.

    4

    Oaxaca

    Oaxaca is a state of Mexico, with its capital at Oaxaca.

    5

    Obwalden

    Obwalden is a canton of Switzerland, with its capital at Sarnen.

    6

    Occidental Mindoro

    Occidental Mindoro is a province of Philippines, with its capital at Mamburao.

    7

    Occitanie

    Occitanie is a region of France, with its capital at Toulouse.

    8

    Odesa Oblast

    Odesa Oblast is an oblast or city of Ukraine, with its capital at Odesa.

    9

    Odisha

    Odisha is a state of India, with its capital at Bhubaneswar.

    10

    Offaly

    Offaly is a county of Ireland, with its capital at Tullamore.

    11

    Ogun

    Ogun is a state of Nigeria, with its capital at Abeokuta.

    12

    Ohio

    Ohio is a state of United States, with its capital at Columbus.

    13

    Ōita

    Ōita is a prefecture of Japan, with its capital at Ōita.

    14

    Okayama

    Okayama is a prefecture of Japan, with its capital at Okayama.

    15

    Okinawa

    Okinawa is a prefecture of Japan, with its capital at Naha.

    16

    Oklahoma

    Oklahoma is a state of United States, with its capital at Oklahoma City.

    17

    Olomouc Region

    Olomouc Region is a region of Czech Republic, with its capital at Olomouc.

    18

    Olt County

    Olt County is a county of Romania, with its capital at Slatina.

    19

    Omsk Oblast

    Omsk Oblast is a federal subject of Russia, with its capital at Omsk.

    20

    Ondo

    Ondo is a state of Nigeria, with its capital at Akure.

    21

    Ontario

    Ontario is a province or territory of Canada, with its capital at Toronto.

    22

    Opole Voivodeship

    Opole Voivodeship is a voivodeship of Poland, with its capital at Opole.

    23

    Oran Province

    Oran Province is a province of Algeria, with its capital at Oran.

    24

    Ordu

    Ordu is a province of Turkey, with its capital at Ordu.

    25

    Örebro County

    Örebro County is a county of Sweden, with its capital at Örebro.

    26

    Oregon

    Oregon is a state of United States, with its capital at Salem.

    27

    Orenburg Oblast

    Orenburg Oblast is a federal subject of Russia, with its capital at Orenburg.

    28

    Oriental (Morocco)

    Oriental (Morocco) is a region of Morocco, with its capital at Oujda.

    29

    Oriental Mindoro

    Oriental Mindoro is a province of Philippines, with its capital at Calapan.

    30

    Oromia Region

    Oromia Region is an region of Ethiopia, with its capital at Addis Ababa.

    31

    Oryol Oblast

    Oryol Oblast is a federal subject of Russia, with its capital at Oryol.

    32

    Osaka Prefecture

    Osaka Prefecture is a prefecture of Japan, with its capital at Osaka.

    33

    Oslo (County)

    Oslo (County) is a county of Norway, with its capital at Oslo.

    34

    Osmaniye

    Osmaniye is a province of Turkey, with its capital at Osmaniye.

    37

    Osun

    Osun is a state of Nigeria, with its capital at Oshogbo.

    38

    Ouargla Province

    Ouargla Province is a province of Algeria, with its capital at Ouargla.

    40

    Overijssel

    Overijssel is a province of Netherlands, with its capital at Zwolle.

    41

    Oyo

    Oyo is a state of Nigeria, with its capital at Ibadan.

About states starting with O

That's our current list of states starting with the letter O. We add new entries every week — if you have a favorite state starting with O that isn't on this page, let us know and we'll write it up.

Looking for more? Try states that end with O, or contain O anywhere in the name.