Its capital and largest town is Nyamira, with an urban population of around 41,668 (2009 census)[3] The county is also referred to as North Kisii.

Permanent rivers include Sondu, Eaka, Kijauri, Kemera, Charachani, Gucha (Kuja), Bisembe, Mogonga, Chirichiro, Ramacha and Egesagane and all of them drain water to Lake Victoria.

There are 150,669 households spawning an average size of 4.0 persons per household and a population density of 675 inhabitants per square kilometre (1,750/sq mi)[6] Religion in Nyamira County [7] There are 5 sub counties, 4 electoral constituencies, 14 divisions, 46 locations and 114 sub-locations.

[8] It has four constituencies and 20 county assembly wards, Source [9] John Obiero Nyangarama was the Governor serving his last term in office after being elected twice 2013, 2017 and his deputy Amos Kimwomi Nyaribo is the current governor .

[22][23] There are 49 trading centres, 2049 registered businesses, 1641 licensed retail traders and 42 supermarkets.