Excluding both South and North Korea, thousands use it in Manchuria, and there is a tribe in South East Asia which uses Korean. Other than that, there are millions around the world using Korea, such as China, Japan, US, etc.
Two countries have Korean as their official language: North Korea South Korea
Korean is the official language of only North Korea and South Korea. However, there are large minority groups that speak Korean in China, Japan, US, and Russia.
The top Korean-speaking countries are South Korea and North Korea. South Korea has a larger population and is more economically developed, while North Korea is known for its strict government control and isolation from the international community. These two countries are where the Korean language is predominantly spoken.
The Korean language is widely spoken in both countries.
South Korea and North Korea are the two countries located on the Korean peninsula.
The official language of North Korea is Korean. The capital of North Korea is Pyongyang which is also the largest city.
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South Korea's official languages are Korean and Korean Sign Language. Their currency is 'won' or ₩.
North Korea and South Korea lie on the Korean Peninsula.
The official language spoken in North Korea is Korean.
Korea is divided into North Korea and South Korea so they are actually different countries, aside from their identical language, history and culture. That's why Korea have 2 flags. The more commonly used is the South Korean flag (for reasons I think are to do with the Korean War) that has been appraised as the flag of Korea combined.