There are 47,564,296 people in Kenya, according to the official 2019 population Census figures released on Monday.
Out of these, 23,548,056 are male and 24,014,716 female.
Releasing the results at State House Nairobi, KNBS director Zachary Mwangi on Monday said the most populous counties are Nairobi (4.3 million), followed by Kiambu (2.4 million), Nakuru (2.1million), Kakamega (1.8 million) and Bungoma (1.6 million).
The least popolous counties are Lamu (143,920), Isiolo (268,002), Samburu (310,327), Tana River (315,943) and Taita Taveta (340,671).
President Uhuru Kenyatta thanked KNBS for conducting a successful Census.
On Monday, he said Kenya is the first country in Africa to release the results two months after the counting exercise was completed.
He said this was the first Census to be conducted under the 2010 Constitution, fully funded by his administration.
"I would also like to thank the security team. I am happy to note that this is the first Census which was fully funded by my administration," Uhuru said after releasing the results.
Uhuru said that the Census results will help in realigning the developmental strategies.
