|Formed||4 March 2013|
|• Governor||James Orengo|
|• Total||2,496.1 km2 (963.7 sq mi)|
|Time zone||UTC+3 (EAT)|
Siaya County is one of the counties in the former Nyanza Province in the Western part of Kenya. It is bordered by Busia County to the north, Kakamega County and Vihiga County's to the northeast and Kisumu County to the southeast. It shares a water border with Homa Bay County which is located south of Siaya County. The total area of the county is approximately 2,496.1 km2. The county lies between latitude 0° 26' to 0° 18' north and longitude 33° 58' east and 34° 33' west. Siaya has been split up into six new districts. Under the Constitution 2010, the role of districts are still unclear as much of administrative authority is being transferred to the county. The capital is Siaya, even though the largest town is Bondo.
The population in the year 2009 was 842,304.
|Local authorities (councils)|
|* 1999 census. Source: [permanent dead link]|
|* 1999 census. Sources: , , also added from District Commissioner's Office, Siaya 2001|
In the 2007 elections the county, then district, had five constituencies: Alego Constituency, Gem Constituency, Rarieda Constituency, Bondo Constituency and Ugenya Constituency.
As of 2013, the county was made up of six constituencies namely Alego Usonga, Bondo, Gem, Rarieda, Ugenya, and Ugunja.
At the 2007 parliamentary elections all five seats were won by Orange Democratic Movement.
|2013||Cornel Amoth Rasanga||ODM||High Court in Kisumu nullified the election on 23 August 2013.|
|—||George Okode||—||County Assembly Speaker elevated to acting governor on 3 September 2013.|
Majority of the population consist of members of the Luo tribe.