The study of elections and parliamentary behaviour in Africa has become a neglected topic. Whilst the emergence of political élites during and after the colonial period has been examined carefully, little attention has been paid to the structure and functioning of the modern one-party state. Emphasis has tended to shift towards the analysis of political economy and of the nature of class relations, partly as a consequence of the close linkages between economic and political relations within developing states. However, studies of post-1969 politics in Kenya are now scarce, and basic knowledge of the operation of the political system is often absent. In order to help redress the balance, this article presents and analyses data about the socio-economic background of the Members of Parliament.