The constituency has three wards comprising Kiru, Kamacharia and Gitugi wards all electing Members of the County Assembly to the Muranga County Assembly.
Mathioya Constituency has six Locations: Aberdare Forest, Gitugi, Kamacharia, Kiru, Njumbi, and Rwathia.
According to the Muranga District’s Statistics Office 2001, Mathioya’s population is 110,139, and is the second largest Constituency after Kiharu with 136.9 sq miles (220.8sq.
Mathioya Constituency has a steep hilly topography and a climate suitable mainly for tea production, although there are pockets of coffee plantations.
The lower parts of Mathioya also grow the macadamia nuts which were introduced in the mid 80’s by the Kenya Nut Company, while the upper part, which is much cooler due to the proximity to the Aberdare Ranges grows pears, plums, apples, tea and coffee.