The first elections of the Isiolo County were held alongside the National elections on 4th March 2013, being the first elections under the Constitution of Kenya 2010. This saw the election of the Governor and the Deputy Governor, Members of Parliament and Ward Representatives. The Assembly proceeded to set up structures for the administration of the Assembly and for the management of the business of the House. The Isiolo County Assembly Service Board (CASB) was constituted pursuant to provisions of section 12 (1) of the County government Act 2012 and has since employed and deployed staff besides budgeting for the efficient running of the Assembly. The County Assembly of Isiolo has provided oversight and exercising countervailing check on the County Executive. With the strengthening of the committee system, the Assembly is expected to provide greater scrutiny on legislative proposals, oversight on the budget and oversight on the general administration of the County

The roles of the county assembly can be derived from Article 185 of the New Constitution of Kenya (2010) which includes;

• The legislative authority of a county

• Making any laws that are necessary for or incidental to, the effective performance of the functions and exercise of the powers of the county government under the Fourth Schedule.

• While respecting the principle of the separation of powers, The County Assembly may exercise oversight over the county executive committee and any other county executive organs.

• The County Assembly may receive and approve plans and policies for;

(a) The management and exploitation of the county’s resources; and

(b) The development and management of its infrastructure and institutions.