Countries That Start With O
Countries that start with O: there is just one, Oman. This page counts the 193 United Nations member states plus the two UN observer states, and gives each country's capital, region, population and size.
Only one member state begins with O: Oman, a coastal nation on the Arabian Peninsula, with Muscat as its capital. That makes O one of the thinnest letters on the world map, and a handy answer to keep ready for geography games.
If you need more O answers, look at capitals instead. Ottawa is the capital of Canada, Oslo is the capital of Norway, and Ouagadougou is the capital of Burkina Faso. Ouagadougou is a favourite in spelling challenges because of its long run of vowels.
- Countries starting with O
- 1
- Most people
- Oman 4.8 million
- Largest by area
- Oman 309,500 km²
Countries that start with O
| Country | Capital | Region | Population | Area |
|---|---|---|---|---|
| Oman | Muscat | Western Asia | 4.8 million | 309,500 km² |
Their official names
- Oman: Sultanate of Oman
Capital cities that start with O
| Capital | Country |
|---|---|
| Oslo | Norway |
| Ottawa | Canada |
| Ouagadougou | Burkina Faso |
Countries that end with O
- Burkina Faso
- Congo
- DR Congo
- Lesotho
- Mexico
- Monaco
- Montenegro
- Morocco
- San Marino
- Togo
- Trinidad and Tobago
Big cities that start with O
| City | Country | Population |
|---|---|---|
| Osaka | Japan | 2.8 million |
| Ouagadougou | Burkina Faso | 2.4 million |
| Ordos | China | 1.9 million |
| Omdurman | Sudan | 1.8 million |
| Onitsha | Nigeria | 1.6 million |
| Omsk | Russia | 1.2 million |
| Oslo | Norway | 1.1 million |
| Ottawa | Canada | 1.0 million |
| Odesa | Ukraine | 1.0 million |
| Oran | Algeria | 803,329 |
| Ota | Japan | 748,081 |
| Oyo | Nigeria | 736,072 |
More that start with O
- NamesOlivia, Oscar
- Girl namesOlivia, Opal
- Boy namesOscar, Owen
- Last namesOrtiz, Owens
- Wordsother, only
- 5-letter wordsother, order
- Adjectivesother, outside
- Positive wordsoutstanding, openly
- Nounsorder, office
- Verbsopen, offer
- Animalsowl, oyster
- Birdsowl, ostrich
- Flowersorchid, oriental poppy
- Plants and treesorange, oak
- CitiesOsaka, Ouagadougou
- US statesOhio, Oklahoma
- Foodsorange, olive
- Fruitsorange, olive
- Vegetablesonion, okra
- Desserts and sweetsoatmeal cookie
- Thingsorgan, oven
- Colorsocean blue, ocher
- Jobsoffice boy, orderly
- Sportsorienteering
- Dog namesOliver, Ollie
Questions people ask
How many countries start with O?
1 country starts with O: Oman.
Which country that starts with O has the most people?
Oman, with about 4.8 million people in the GeoNames count.
What capital cities start with O?
Oslo (Norway), Ottawa (Canada), Ouagadougou (Burkina Faso).
Source: the 193 United Nations member states plus the two UN observer states (Vatican City and Palestine). Capitals, regions and land areas come from the open mledoze countries dataset; populations from the GeoNames database. Country names use common English short forms.
See every letter on one page: countries A to Z