County Regions
Western Region
This region with the top performing counties has 4 counties namely, Bungoma, Vihiga, Kakamega and Busia and a population of nearly 4.5 million. All the counties were ranked in the top twenty and their average performance was 58.5%.
2015
| RANK | COUNTY | POPULATION CENSUS 2009 | COUNTYTRAK PERFORMANCE INDEX |
| 1 | BUNGOMA | 1,670,570 | 60.3% |
| 2 | VIHIGA | 554,622 | 59.8% |
| 3 | KAKAMEGA | 1,867,579 | 57.7% |
| 4 | BUSIA | 893,681 | 56.2% |
| 4,986,452 | 58.5% |
2020
| RANK | COUNTY | POPULATION CENSUS 2019 | COUNTYTRAK PERFORMANCE INDEX |
| 1 | KAKAMEGA | 1,867,579 | 57.20% |
| 2 | VIHIGA | 590,013 | 51.10% |
| 3 | BUNGOMA | 1,670,570 | 50.30% |
| 4 | BUSIA | 893,681 | 46.70% |
| 5,021,843 | 47.50% |
Kakamega County
| Governor | WYCLIFFE OPARANYA |
| Senator | MALALAH CLEOPHAS WAKHUNGU |
| Women Representative | MUHANDA ELSIE BUSIHILE |
Vihiga County
| Governor | OTTICHILO WILBER KHASILWA |
| Senator | GEORGE KHANIRI |
| Women Representative | ADAGALA BEATRICE KAHAI |
Bungoma County
| Governor | WANGAMATI WYCLIFFE |
| Senator | WETANGULA MOSES MASIKA |
| Women Representative | WAMBILIANGA CATHERINE |
Busia County
| Governor | SOSPETER OJAAMONG |
| Senator | WAKO SITSWILA AMOS |
| Women Representative | MUTUA FLORENCE MWIKALI |
Kakamega County(2023)
| Governor | H.E Fernandes Barasa |
| Senator | Hon. Boni Khalwale |
| Women Representative | Muhanda Elsie Busihile |
Vihiga County(2023)
| Governor | H.E Dr. Wilber Khasilwa Ottichilo |
| Senator | Hon. Godfrey Osotsi |
| Women Representative | Adagala Beatrice Kahai |
Bungoma County(2023)
| Governor | H.E Ken Lusaka |
| Senator | Hon. David Wafula Wakoli |
| Women Representative | Wambilianga Catherine Nanjala |
Busia County(2023)
| Governor | H.E Paul Otuoma |
| Senator | Hon. Okoiti Omtatah |
| Women Representative | Omanyo, Catherine Nakhabi |