The List of counties of Kenya ranks the 47 counties of Kenya by total area and density as of 2019 Census. The 47 counties have a combined total area of 591,971 km², including 580,609 km² of land and 11,362 km² of water. Marsabit is the largest county with a total area of 76,031 km², followed by Turkana at 70,586 km² and Wajir at 56,649 km². Mombasa is the smallest county by area at 216 km², followed by Vihiga at 563 km² and Nairobi at 707 km². Population is mainly concentrated in the southwestern quadrant, particularly around the Lake Victoria area, the Kenya highlands eg the Mount Kenya region, the Central Rift Valley and the Nairobi metropolitan area, while Northern Kenya is sparsely populated due to harsh climatic conditions and insecurity. Nairobi has the highest population density at 6,247 people per km², followed by Mombasa at 5,495 and Vihiga at 1,047, while Marsabit has the lowest density at 6 people per km², followed by Tana River at 8 and Isiolo at 11.
List + List of Kenyan counties by total area Rank County Total area (km²) Share of Kenya (%) Land area (km²) Water (%) Population density (per km²) Population (2019) Total 591,971 97.04 580,609 1.92 82 47,564,296 1 Marsabit 76,031 12.46 71,905 5.43 6 459,785 2 Turkana 70,586 11.57 68,307 3.23 14 926,976 3 Wajir 56,649 9.29 56,649 0.00 14 781,263 4 Garissa 43,591 7.15 43,591 0.00 19 841,353 5 Tana River 39,153 6.42 39,153 0.00 8 315,943 6 Kitui 30,437 4.99 30,437 0.00 37 1,136,187 7 Mandera 25,986 4.26 25,986 0.00 33 867,457 8 Isiolo 25,382 4.16 25,382 0.00 11 268,002 9 Kajiado 21,899 3.59 21,783 0.53 51 1,117,840 10 Samburu 21,024 3.45 21,024 0.00 15 310,327 11 Narok 17,943 2.94 17,943 0.00 65 1,157,873 12 Taita/Taveta 17,120 2.81 17,090 0.18 20 340,671 13 Kilifi 12,505 2.05 12,396 0.87 116 1,453,787 14 Baringo 10,912 1.79 10,717 1.79 61 666,763 15 Laikipia 9,544 1.56 9,544 0.00 54 518,560 16 West Pokot 9,108 1.49 9,108 0.00 68 621,241 17 Kwale 8,230 1.35 8,165 0.79 105 866,820 18 Makueni 8,172 1.34 8,172 0.00 121 987,653 19 Nakuru 7,489 1.23 7,287 2.70 290 2,162,202 20 Meru 7,057 1.16 7,057 0.00 221 1,545,714 21 Lamu 6,140 1.01 5,832 5.02 23 143,920 22 Machakos 6,016 0.99 6,016 0.00 235 1,421,932 23 Homa Bay 4,760 0.78 2,696 43.36 359 1,131,950 24 Siaya 3,542 0.58 2,453 30.75 393 993,183 25 Uasin Gishu 3,407 0.56 3,407 0.00 343 1,163,186 26 Nyeri 3,336 0.55 3,336 0.00 228 759,164 27 Nyandarua 3,270 0.54 3,267 0.09 194 638,289 28 Migori 3,165 0.52 3,165 0.00 427 1,116,436 29 Bungoma 3,033 0.50 3,033 0.00 552 1,670,570 30 Kakamega 3,023 0.50 3,023 0.00 618 1,867,579 31 Elgeyo/Marakwet 3,018 0.49 3,018 0.00 150 454,480 32 Nandi 2,847 0.47 2,847 0.00 310 885,711 33 Embu 2,828 0.46 2,828 0.00 216 608,599 34 Kisumu 2,677 0.44 2,110 21.18 554 1,155,574 35 Kericho 2,617 0.43 2,617 0.00 370 901,777 36 Kiambu 2,569 0.42 2,569 0.00 952 2,417,735 37 Murang'a 2,527 0.41 2,527 0.00 419 1,056,640 38 Tharaka-Nithi 2,514 0.41 2,514 0.00 153 393,177 39 Trans Nzoia 2,496 0.41 2,496 0.00 397 990,341 40 Bomet 2,355 0.39 2,355 0.00 346 875,689 41 Busia 1,830 0.30 1,686 7.87 527 893,681 42 Kirinyaga 1,475 0.24 1,475 0.00 413 610,411 43 Kisii 1,321 0.22 1,321 0.00 958 1,266,860 44 Nyamira 901 0.15 901 0.00 675 605,576 45 Nairobi 707 0.12 707 0.00 6,247 4,397,073 46 Vihiga 563 0.09 563 0.00 1,047 590,013 47 Mombasa 216 0.04 151 30.09 5,495 1,208,333
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