Kenya joined the Commonwealth in 1963 on independence from Britain, and the United Nations records its admission in the same year
Background
The Commonwealth records that Kenya joined the organisation in 1963, following independence from Britain.
The Commonwealth lists Kenya's capital as Nairobi, its area as 591,971 square kilometres and its population as 53.77 million for 2022.
The United Nations list of member states gives Kenya's date of admission as 16 December 1963.
Kenya is therefore one of the African states that entered both the Commonwealth and the United Nations in its first year of independence.
In plain words
Commonwealth Commonwealth of Nations — An association of states, most of them former British territories, which Kenya joined on independence.