Kisii, Kirinyaga, and Nyamira counties recorded the highest proportions of Christians in Kenya, each with over 98% of their populations identifying as Christian. In contrast, Mandera and Wajir had the lowest proportions, with less than 1%. In terms of absolute numbers, Nairobi, Kiambu, and Nakuru had the largest Christian populations, each exceeding two million Christians, while Wajir and Mandera reported fewer than 10,000 Christians. The North Eastern region had the fewest Christians overall, largely due to the predominance of Islam, followed by the Coastal region. Conversely, Central Kenya, the Western region, and parts of Lower Eastern had the highest concentrations of Christians both proportionally and numerically.