Siaya's 2026 population is now estimated at 43,922. In 1979, the population of Siaya was 4,022. Siaya has grown by 1,730 in the last year, which represents a 4.1% annual change. These population values and projections come from Kenya city census series 1969 to 2009 via CityPopulation fallback access, Kenya 2019 Census population in urban centers by sex and urban center (KNBS) and World Population Review Internal Projections .
| City | 2026 Pop. ↓ | Growth |
|---|---|---|
| Nairobi | 5,603,502 | 3.52% |
| Mombasa | 1,478,607 | 2.93% |
| Nakuru | 809,825 | 5.13% |
| Ruiru | 695,513 | 5.13% |
| Eldoret | 675,073 | 5.13% |
| Kisumu | 544,902 | 4.59% |
| Kikuyu | 453,420 | 4.92% |
| Thika | 356,764 | 5.13% |
| Naivasha | 281,605 | 5.13% |
| Karuri | 275,784 | 5.13% |
| Ongata Rongai | 244,887 | 5.13% |
| Kitale | 230,136 | 5.13% |
| Juja | 221,433 | 5.13% |
| Kitengela | 219,155 | 5.13% |
| Garissa | 216,621 | 4.11% |
| Kiambu | 209,838 | 5.13% |
| Mandera | 162,793 | 5.13% |
| Kisii | 159,527 | 5.13% |
| Malindi | 155,350 | 3.77% |
| Kakamega | 148,762 | 4.79% |
| Mlolongo | 136,351 | 0% |
| Mtwapa | 128,677 | 5.13% |
| Wajir | 127,881 | 5.13% |
| Lodwar | 117,740 | 5.13% |
| Athi River (Mavoko) | 115,373 | 5.13% |
| Meru | 113,796 | 5.13% |
| Isiolo | 111,610 | 5.13% |
| Kiserian | 109,131 | 5.13% |
| Kilifi | 105,394 | 5.13% |
| Nanyuki | 103,327 | 5.13% |
| Busia | 102,011 | 5.13% |
| Ngong | 101,215 | -0.16% |
| Limuru | 99,094 | 2.87% |
| Nyeri | 96,680 | 2.73% |
| Narok | 92,850 | 5.13% |
| Ukunda | 92,557 | 2.53% |
| Embu | 92,210 | 5.13% |
| Migori | 89,210 | 3.18% |
| Machakos | 87,138 | 4.56% |
| Elwak | 86,183 | 5.13% |
| Gilgil | 82,734 | 4.52% |
| Bungoma | 79,487 | 2.25% |
| Voi | 75,712 | 5.13% |
| Wanguru | 73,397 | 5.13% |
| Habaswein | 70,384 | 5.13% |
| Kimilili | 69,849 | 3.19% |
| Moyale | 67,902 | 5.13% |
| Kericho | 65,287 | 2.8% |
| Molo (Turi) | 63,763 | 4.03% |
| Githunguri | 63,319 | 0% |
| Masalani | 61,931 | 5.13% |
| Homa Bay | 61,693 | 4.63% |
| Murang'a | 61,465 | 5.13% |
| Webuye | 60,512 | 5.13% |
| Njoro | 59,846 | 5.13% |
| Kapsabet | 59,597 | 5.13% |
| Marsabit | 51,497 | 5.13% |
| Rhamu | 47,160 | 4.08% |
| Maralal | 44,488 | 5.13% |
| Mumias | 44,434 | 0.83% |
| Kenol | 44,086 | 0% |
| Siaya | 43,922 | 4.1% |
| Mairo Inya | 43,320 | 5.13% |
| Kerugoya | 39,779 | 4.09% |
| Watamu | 39,531 | 5.13% |
| Kitui | 39,035 | 4.3% |
| Lamu | 36,023 | 5.13% |
| Makutano (Kapenguria) | 35,880 | 3.36% |
| Nyahururu | 35,589 | -0.8% |
| Kajiado | 35,020 | 5.13% |
| Nyamira | 34,743 | 5.13% |
| Karatina | 33,422 | 5.13% |
| Mariakani | 32,467 | 0.34% |
| Chuka | 31,770 | 5.13% |
| Bondo | 31,127 | 4.61% |
| Hola | 29,676 | 5.13% |
| Mai Mahiu | 29,549 | 5.13% |
| Maua | 29,373 | 4.13% |
| Rongo | 29,358 | 5.13% |
| Oyugis | 28,306 | 5.13% |
| Wote | 27,991 | 5.13% |
| Kehancha | 27,670 | 3.2% |
| Elburgon | 27,550 | -0.41% |
| Kabarnet | 27,025 | 2.67% |
| Taveta | 26,509 | 2.69% |
| Emali | 26,004 | 5.13% |
| Garbatula | 24,753 | 5.13% |
| Eldama Ravine | 24,499 | 1.96% |
| Isebania | 23,891 | 0% |
| Kiminini | 23,500 | 5.13% |
| Lafey | 22,882 | 0% |
| Takaba | 21,691 | 0.12% |
| Makindu | 21,340 | 5.13% |
| Namanga | 21,175 | 5.12% |
| Mbita (Mbita Point) | 18,796 | 3.36% |
| Mwingi | 18,690 | 1.34% |
| Kakuma | 18,400 | -3.13% |
| Moi's Bridge | 18,103 | 1.46% |
| Msambweni | 16,944 | 1.8% |
| Mazeras | 16,254 | 0% |
| Awendo | 16,089 | -0.63% |
| Malaba | 15,550 | -0.03% |
| Banisa (Banissa) | 14,974 | 0% |
| Mbale (Vihiga) | 12,264 | -4.88% |
