Tharaka-Nithi County is one of the 47 counties of Kenya located in Kenya's former Eastern Province. The county has an area of 2609 km2 and as of the 2019 census a population of 393,177.
Tharaka-Nithi County is the home to the Chuka, Muthambi, Mwimbi and Tharaka sections of the Ameru (Meru) community. The people of Tharaka-Nithi County are nowo predominantly Christian with the Catholics, the Presbyterian, and the Methodists being the predominant religious communities.