* Tanzania: Swahili is the national language of Tanzania and is spoken by a vast majority of the population.
* Kenya: Swahili is one of the official languages of Kenya and is widely spoken, particularly in urban areas and government.
* Uganda: Swahili is a significant language in Uganda, especially in the western and northern regions.
* Rwanda: Swahili is a widely spoken language in Rwanda, particularly in the capital city of Kigali and in commercial areas.
* Burundi: Swahili is widely understood in Burundi and is often used for communication across different ethnic groups.
* Democratic Republic of Congo: Swahili is a lingua franca in the eastern part of the country.
* Other Countries: Swahili is also spoken in smaller communities in other countries like Malawi, Zambia, and Mozambique.
It's important to note that Swahili is not just a language spoken in these countries, it's also an important part of their cultural identity.