The constituencies of Kenya are used to elect members of the National Assembly, the lower chamber of the Kenyan Parliament. In accordance with Article 89 of the 2010 Constitution of Kenya, there are 290 constituencies, based on a formula where these constituencies were to be delineated based on population numbers. Each constituency returns one Member of National Assembly. The constituencies are further divided into electoral wards.

Overview Constituencies were introduced to Kenya during the colonial era. The first general election was held in 1920 in the then East Africa Protectorate, with 11 constituencies. Between 1920 and 1956, the number of constituencies rose from 11 to 28. In 1962, prior to independence the following year, the Royal Commission was tasked to create 100 constituencies. The independence Constitution of Kenya provided that for purposes of representation in the House of Representatives, the constituencies should be between 110 and 130. The Royal Commission drew 117 constituencies across the 40 districts and Nairobi region.

The number of constituencies increased from 117 at independence to 290 in 2013. There have been four major constituency delineations since independence: in 1966, 1986, 1996 and 2012. In 1966, the number rose from 117 to 158, to accommodate senators from the abolished Senate of Kenya. At this point the House of Representatives was renamed National Assembly. In 1986, an act of parliament allowed the number of constituencies to be increased from 158 to 188. The constituencies were effected during the 1988 Kenyan general election. In 1996, the number of constituencies was increased from 188 to 210. The number remained the same until the 2010 Constitution of Kenya increased the number of constituencies to 290, which based on a formula where these constituencies were to be delineated based on population numbers.

Each constituency returns one Member of Parliament. The constitution mandates that the Independent Electoral and Boundaries Commission (IEBC) conduct a boundary review at a minimum of eight years and a maximum of twelve years. Since the last boundaries review was conducted in March 2012, by August 2024, long after the 12-year deadline, no review has been conducted. This is attributed to the fact that there is no functioning IEBC, since most of all commissioners either resigned or retired at some point between 2022 and 2023.

Constituencies by Region (Former Province)

+ Regions, Population and No. of Constituencies Region Area (km2) Population (2019) Number of ConstituenciesCoast 83,6034,329,474 26 North Eastern 126,9022,490,07318 Eastern 159,8916,821,049 44 Central 13,1765,482,239 34 Rift Valley 173,86812,752,966 76Western 8,3605,021,843 33 Nyanza 16,1626,269,579 42 Nairobi 6844,397,073 17 KENYA582,646 47,564,296 290

Former Coast Province

+ Constituencies and population County Population (2019) Number of seats Constituencies Mombasa 1,208,333 6 1. Changamwe2. Jomvu3. Kisauni4. Nyali5. Likoni6. Mvita Kwale County 866,820 4 7. Msambweni8. Lunga Lunga9. Matuga10. Kinango Kilifi County 1,453,787 7 11. Kilifi North12. Kilifi South13. Kaloleni14. Rabai15. Ganze16. Malindi17. Magarini Tana River County 315,943 3 18. Garsen19. Galole20. Bura Lamu County 143,920 2 21. Lamu East22. Lamu West Taita–Taveta County 340,671 4 23. Taveta24. Wundanyi25. Mwatate26. Voi

Former North Eastern Province

Garissa County Population (2009): 623,060 Current number of seats: 6 Constituencies: 27. Garissa Township (formerly Dujis Constituency), 28. Balambala, 29. Lagdera, 30. Dadaab, 31. Fafi, 32. Ijara.

Wajir County Population (2009): 661,941 Current number of seats: 6 Constituencies: 33. Wajir North, 34. Wajir East, 35. Tarbaj, 36. Wajir West, 37. Eldas, 38. Wajir South.

Mandera County Population (2009): 1,025,756 Current number of seats: 6 Constituencies: 39. Mandera West, 40. Banissa, 41. Mandera North, 42. Mandera South, 43. Mandera East, 44. Lafey.

Former Eastern Province

Marsabit County Population (2009): 291,166 Current number of seats: 4 Constituencies: 45. Moyale, 46. North Horr, 47. Saku, 48. Laisamis.

Isiolo County Population (2009): 143,294 Current number of seats: 2 Constituencies: 49. Isiolo North, 50. Isiolo South.

Meru County Population (2009): 1,356,301 Current number of seats: 9 Constituencies: 51. Igembe South, 52. Igembe Central, 53. Igembe North, 54. Tigania West, 55. Tigania East, 56. North Imenti, 57. Buuri, 58. Central Imenti, 59. South Imenti.

Tharaka-Nithi County Population (2009): 365,330 Current number of seats: 3 Constituencies: 60. Maara, 61. Chuka/Igambang'ombe, 62. Tharaka.

Embu County Population (2019): 516,212 Current number of seats: 4 Constituencies: 63. Manyatta, 64. Runyenjes, 65. Mbeere South, 66. Mbeere North.

Kitui County Population (2009): 1,012,709 Current number of seats: 8 Constituencies: 67. Mwingi North, 68. Mwingi West, 69. Mwingi Central, 70. Kitui West, 71. Kitui Rural, 72. Kitui Central, 73. Kitui East, 74. Kitui South.

Machakos County Population (2009): 1,098,584 Current number of seats: 8 Constituencies: 75. Masinga, 76. Yatta, 77. Kangundo, 78. Matungulu, 79. Kathiani, 80. Mavoko, 81. Machakos Town, 82. Mwala.

Makueni County Population (2009): 111,179 Current number of seats: 6 Constituencies: 83. Mbooni, 84. Kilome, 85. Kaiti, 86. Makueni, 87. Kibwezi West, 88. Kibwezi East.

Former Central Province

Nyandarua County Population (2009): 596,268 Current number of seats: 5 Constituencies: 89. Kinangop, 90. Kipipiri, 91. Ol Kalou, 92. Ol Jorok, 93. Ndaragwa.

Nyeri County Population (2009): 693,558 Current number of seats: 6 Constituencies: 94. Tetu, 95. Kieni, 96. Mathira, 97. Othaya, 98. Mukurweini, 99. Nyeri Town.

Kirinyaga County Population (2009): 528,054 Current number of seats: 4 Constituencies: 100. Mwea, 101. Gichugu, 102. Ndia, 103. Kirinyaga Central.

Murang'a County Population (2009): 942,581 Current number of seats: 7 Constituencies: 104. Kangema, 105. Mathioya, 106. Kiharu, 107. Kigumo, 108. Maragwa, 109. Kandara, 110. Gatanga.

Kiambu County Population (2009): 1,623,282 Current number of seats: 12 Constituencies: 111. Gatundu South, 112. Gatundu North, 113. Juja, 114. Thika Town, 115. Ruiru, 116. Githunguri, 117. Kiambu, 118. Kiambaa, 119. Kabete, 120. Kikuyu, 121. Limuru, 122. Lari.

Former Rift Valley Province

Turkana County Population (2009): 855,399 Current number of seats: 6 Constituencies: 123. Turkana North, 124. Turkana West, 125. Turkana Central, 126. Loima, 127. Turkana South, 128. Turkana East.

West Pokot County Population (2009): 512,690 Current number of seats: 4 Constituencies: 129. Kapenguria, 130. Sigor, 131. Kacheliba, 132. Pokot South.

Samburu County Population (2009): 223,947 Current number of seats: 3 Constituencies: 133. Samburu West, 134. Samburu North, 135. Samburu East.

Trans-Nzoia County Population (2009): 818,757 Current number of seats: 5 Constituencies: 136. Kwanza, 137. Endebess, 138. Saboti, 139. Kiminini, 140. Cherangany.

Uasin Gishu County Population (2009): 894,179 Current number of seats: 6 Constituencies: 141. Soy, 142. Turbo, 143. Moiben, 144. Ainabkoi, 145. Kapseret, 146. Kesses.

Elgeyo-Marakwet County Population (2009): 369,998 Current number of seats: 4 Constituencies: 147. Marakwet East, 148. Marakwet West, 149. Keiyo North, 150. Keiyo South.

Nandi County Population (2009): 752,966 Current number of seats: 6 Constituencies: 151. Tinderet, 152. Aldai, 153. Nandi Hills, 154. Chesumei, 155. Emgwen, 156. Mosop.

Baringo County Population (2009): 555,561 Current number of seats: 6 Constituencies: 157. Tiaty, 158. Baringo North, 159. Baringo Central, 160. Baringo South, 161. Mogotio, 162. Eldama Ravine.

Laikipia County Population (2009): 399,227 Current number of seats: 3 Constituencies: 163. Laikipia West, 164. Laikipia East, 165. Laikipia North.

Nakuru County Population (2009): 1,603,325 Current number of seats: 11 Constituencies: 166. Molo, 167. Njoro, 168. Naivasha, 169. Gilgil, 170. Kuresoi South, 171. Kuresoi North, 172. Subukia, 173. Rongai, 174. Bahati, 175. Nakuru Town West, 176. Nakuru Town East.

Narok County Population (2009): 850,920 Current number of seats: 6 Constituencies: 177. Kilgoris, 178. Emurua Dikirr, 179. Narok North, 180. Narok East, 181. Narok South, 182. Narok West.

Kajiado County Population (2009): 687,312 Current number of seats: 5 Constituencies: 183. Kajiado North, 184. Kajiado Central, 185. Kajiado East, 186. Kajiado West, 187. Kajiado South.

Kericho County Population (2009): 758,339 Current number of seats: 6 Constituencies: 188. Kipkelion East, 189. Kipkelion West, 190. Ainamoi, 191. Bureti, 192. Belgut, 193. Sigowet–Soin.

Bomet County Population (2009): 545,378 Current number of seats: 5 Constituencies: 194. Sotik, 195. Chepalungu, 196. Bomet East, 197. Bomet Central, 198. Konoin.

Former Western Province

Kakamega County Population (2009): 1,660,768 Current number of seats: 12 Constituencies: 199. Lugari, 200. Likuyani, 201. Malava, 202. Lurambi, 203. Navakholo, 204. Mumias West, 205. Mumias East, 206. Matungu, 207. Butere, 208. Khwisero, 209. Shinyalu, 210. Ikolomani.

Vihiga County Population (2009): 554,622 Current number of seats: 5 Constituencies: 211. Vihiga, 212. Sabatia, 213. Hamisi, 214. Luanda, 215. Emuhaya.

Bungoma County Population (2009): 1,630,934 Current number of seats: 9 Constituencies: 216. Mount Elgon, 217. Sirisia, 218. Kabuchai, 219. Bumula, 220. Kanduyi, 221. Webuye East, 222. Webuye West, 223. Kimilili, 224. Tongaren.

Busia County Population (2009): 488,075 Current number of seats: 7 Constituencies: 225. Teso North, 226. Teso South, 227. Nambale, 228. Matayos, 229. Butula, 230. Funyula, 231. Budalangi.

Former Nyanza Province

Siaya County Population (2009): 842,304 Current number of seats: 6 Constituencies: 232. Ugenya, 233. Ugunja, 234. Alego Usonga, 235. Gem, 236. Bondo, 237. Rarieda.

Kisumu County Population (2009): 968,909 Current number of seats: 7 Constituencies: 238. Kisumu East, 239. Kisumu West, 240. Kisumu Central, 241. Seme, 242. Nyando, 243. Muhoroni, 244. Nyakach.

Homa Bay County Population (2009): 963,794 Current number of seats: 8 Constituencies: 245. Kasipul, 246. Kabondo Kasipul, 247. Karachuonyo, 248. Rangwe, 249. Homa Bay Town, 250. Ndhiwa, 251. Suba North 252. Suba South.

Migori County Population (2009): 1,028,579 Current number of seats: 8 Constituencies: 253. Rongo, 254. Awendo, 255. Suna East, 256. Suna West, 257. Uriri, 258. Nyatike, 259. Kuria West, 260. Kuria East.

Kisii County Population (2009): 1,152,282 Current number of seats: 9 Constituencies: 261. Bonchari, 262. South Mugirango, 263. Bomachoge Borabu, 264. Bobasi, 265. Bomachoge Chache, 266. Nyaribari Masaba, 267. Nyaribari Chache, 268. Kitutu Chache North, 269. Kitutu Chache South.

Nyamira County Population (2009): 598,252 Current number of seats: 4 Constituencies: 270. Kitutu Masaba, 271. West Mugirango, 272. North Mugirango, 273. Borabu.

Former Nairobi Province

Nairobi County Population (2009): 3,138,369 Current number of seats: 17