Tharaka-Nithi County is one of the 47 counties of Kenya located in Kenya located in the eastern Mount Kenya region. The county has an area of 2609 km² and as of the 2019 census a population of 393,177. It is home to the Meru people.

Tharaka-Nithi County is home to the Chuka, Muthambi, Mwimbi and Tharaka subgroups of the Ameru community. The people of Tharaka-Nithi County are predominantly Christian, with Catholics, Presbyterians, and Methodists being the predominant religious communities.

The county consists of three constituencies: Maara, Chuka and Tharaka.

In 1992, Meru District was broken up into four new districts: Meru Central, Meru North, Meru South and Tharaka. Subsequently, Meru South, also known as Nithi, combined with Tharaka into the Tharaka-Nithi District. In 1998, the Tharaka-Nithi District was split into two districts, Nithi and Tharaka, but a 2009 High Court decision declared that split unconstitutional and re-combined the two. Subsequently, under the revised constitution of 2010, Tharaka-Nithi became a county.

Like other counties surrounding Mount Kenya, the primary economic activity in Tharaka-Nithi County is farming. Crops planted include tea and coffee in the higher areas of the county while sorghum, maize, green grams and millet in the low altitude areas. Dairy farming and fish farming are also practiced in the county.

Religion in Tharaka-Nithi County