Constituencies of Kenya are used to elect members of the National Assembly, the lower chamber of the Kenyan Parliament. In accordance with article 89 of the 2010 Constitution of Kenya, there are 290 constituencies, based on a formula where these constituencies were to be delineated based on population numbers. Each constituency returns one MP. In the following lists, the population of each of the 47 counties is given as enumerated in the census of 24 August 2009. Under each county is, the number of seats it has and a list of constituencies are given.