Nyamira County Assembly has 20 elected members, thirteen nominated members(yet to be nominated), the Speaker and Deputy Speaker. The Clerk of the Assembly is an authorised officer in Assembly.
The County Assembly exercises power to enact laws at the county level. The County Assembly of Nyamira discharges its mandate of legislation, representation and oversight in a serene environment with the unrelenting support of the, multi-talented, effective and efficient Honorable Members and staff of the Assembly. It receives and approves plans and policies for the management of the County’s resources, infrastructure and institutions
| MEMBER OF COUNTY ASSEMBLY | WARD | PARTY |
| NYAMBEGA GISESA | RIGOMA | UPA |
| ALFAYO NGERESA | MEKENENE | UPA |
| PRINCIPAL OGETO | MANGA | PPOK |
| ABEL MOSE | MAGWAGWA | UPA |
| OSIEMO ELIJAH | NYAMAIYA | UPA |
| DUKE MASIRA | TOWNSHIP | ODM |
| BENECHA THOMAS | KIABONYORU | ODM |
| NYAKIANGA | ITIBO | ANC |
| CHARLES KEGANDA | BOSAMARO | JUBILEE |
| JOSIAH MANG’ERA | ESISE | ODM |
| MINDA RIECH | MAGOMBO | FORD KENYA |
| JACKSON MOGUSU | NYANSIONGO | UPA |
| JOEL OMBONGI | BOKEIRA | UPA |
| JULIUS MATWERE | BONYAMATUTA | INDEPENDENT |
| JAMES MATING’A | KEMERA | WIPER |
| HENRY OBWAYA | GACHUBA | |
| ATUTI NYAMEINO | GESIMA | UDA |
| THADDEUS NYABARO | EKERENYO | UPA |
| GEORGIA ABUGA | BOGICHORA | ODM |
| JULIUS NYANGANA | BOMWAGAMO | FORD KENYA |
A County Assembly consists of-
- Members elected by the registered voters of the Wards, each Ward constituting a single member Constituency, on the same day as a general election of Members of Parliament, being the second Tuesday in August, in every fifth year.
- The number of Special Seat Members necessary to ensure that no more than two-thirds of the Membership of the Assembly are of the same gender
- The number of Members of Marginalised Groups, including Persons with Disabilities and the Youth, prescribed by an Act of Parliament; and
- The Speaker, who is an ex officio member