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Kenya is a multi-ethnic state in the Great Lakes region of Southeast Africa. It is primarily inhabited by Bantu and Nilotic populations, with some Cushitic ethnic minorities in the north. Its total population is estimated at 41 million inhabitants as of 2011.
A national census was conducted in 1999, but its final results were never released. A new census was undertaken in 2009, but it turned out to be controversial, as the questions about ethnic affiliation seemed inappropriate after the ethnic violence of the previous year. Preliminary results of the census were published in 2010.
Kenya's population was reported as 38.6 million in 2009, compared to in 28.7 million in 1999, 21.4 million in 1989 and 15.3 million 1979, an increase by a factor of 2.5 over 30 years, or an average growth of more than 3% per year. The population growth rate has been reported as somewhat reduced during the 2000s and is now estimated at 2.7% (as of 2010), resulting in an estimate of a total population 41 million in 2011.
Kenya has a very diverse population that includes most major ethnic, racial and linguistic groups found in Africa. The majority of the country's population belongs to various Bantu sub-groups, with a significant number of Nilotes.
Kenya's diversity is such that its largest ethnic group, the Kikuyu, make up for less than a fifth of total population. Ever since Kenyan independence in 1963, Kenyan politics have been characterized by ethnic tensions and rivalry between the larger groups, devolving into ethnic violence in the 2007–2008 Kenyan crisis.
The 2009 census figures give the ethnic composition as follows (out of a total population of 38.6 million): Kikuyu 20%, Luhya 14%, Kalenjin 13%, Luo 10%, Kamba 10%, Kisii 6%, Mijikenda 5%, Meru 4%, Turkana 2.5%, Maasai 2.1%. Around 9% of the population consists of smaller groups numbering below 1% each; non-African groups (Arabs, Indians and Europeans) are estimated to total about 1%.
Bantus are the single largest population division in Kenya. The term Bantu denotes widely-dispersed but related peoples that speak south-central Niger–Congo languages. Originally from West-Central Africa, Bantus began a millennium-long series of migrations referred to as the Bantu expansion that first brought them to Southeast Africa about 2000 years ago.
Most Bantu are farmers. Some of the prominent Bantu groups in Kenya include the Kikuyu, the Kamba, the Luhya, the Meru, the Mijikenda and the Kisii. The Swahili people are descended from Mijikenda Bantu peoples that intermarried with immigrant Arab and Persian traders.
Nilotes are the second-largest group of peoples in Kenya. They speak Nilo-Saharan languages and came to Southeast Africa by way of South Sudan. Most Nilotes in Kenya are herdsmen, and they have a fearsome reputation as warriors and cattle-rustlers. The most prominent of these groups include the Luo, Maasai, the Samburu, the Turkana, and the Kalenjin. As with the Bantu, the Nilotes have adopted many customs and practices from the Cushitic groups, including the age set system of social organization, circumcision, and vocabulary terms.
Cushitic peoples form a small minority of Kenya's population. They speak Afro-Asiatic languages, and originally came from Ethiopia and Somalia in Northeast Africa. Most are herdsmen and Muslim. Cushites are concentrated in the northernmost North Eastern Province, which borders Somalia.
The Cushitic-speaking peoples are divided into two groups: the Southern Cushites and Eastern Cushites.
Kenya's various ethnic groups typically speak their mother tongues within their own communities. The two official languages, English and Swahili, are used in varying degrees of fluency for communication with other populations. English is widely spoken in commerce, schooling and government. Peri-urban and rural dwellers are less multilingual, with many in rural areas speaking only their native languages.
According to Ethnologue, there are a total of 69 languages spoken in Kenya. Most belong to two broad language families: Niger-Congo (Bantu branch) and Nilo-Saharan (Nilotic branch), spoken by the country's Bantu and Nilotic populations, respectively. The Cushitic and Arab ethnic minorities speak languages belonging to the separate Afro-Asiatic family, with the Indian and European residents speaking languages from the Indo-European family.
According to the 2010 revison of the World Population Prospects, the total population was 40,513,000 in 2010 compared to only 6,077,000 in 1950. The proportion of children below the age of 15 in 2010 was 42.5%, 54.9% was between 15 and 65 years of age, and 2.7% was 65 years or older.
|Total population (x 1000)||Population aged 0–14 (%)||Population aged 15–64 (%)||Population aged 65+ (%)|
|Kenya (country total)||38,610,097|
|Nairobi (capital city)||3,138,369|
|2009 (census)||4,6 (Urban-2,9; Rural-5,2)|
Numbers are in thousands. UN medium variant projections 
Registration of vital events is in Kenya not complete. The Population Department of the United Nations prepared the following estimates. 
|Period||Live births per year||Deaths per year||Natural change per year||CBR*||CDR*||NC*||TFR*||IMR*|
|1950-1955||334 000||154 000||181 000||51.2||23.6||27.7||7.48||147|
|1955-1960||388 000||163 000||225 000||51.5||21.6||29.8||7.79||134|
|1960-1965||449 000||165 000||284 000||51.0||18.8||32.2||8.07||117|
|1965-1970||525 000||172 000||353 000||50.6||16.5||34.1||8.11||104|
|1970-1975||628 000||178 000||450 000||50.8||14.4||36.4||7.99||91|
|1975-1980||743 000||186 000||557 000||49.9||12.5||37.4||7.64||80|
|1980-1985||869 000||192 000||677 000||48.4||10.7||37.7||7.22||70|
|1985-1990||972 000||214 000||757 000||45.1||9.9||35.1||6.54||67|
|1990-1995||1 003 000||252 000||751 000||39.4||9.9||29.5||5.57||66|
|1995-2000||1 115 000||345 000||770 000||38.0||11.8||26.2||5.07||69|
|2000-2005||1 294 000||427 000||867 000||38.7||12.8||25.9||5.00||70|
|2005-2010||1 447 000||429 000||1 017 000||38.0||11.3||26.7||4.80||65|
|* CBR = crude birth rate (per 1000); CDR = crude death rate (per 1000); NC = natural change (per 1000); IMR = infant mortality rate per 1000 births; TFR = total fertility rate (number of children per woman)|
The following demographic statistics are from the CIA World Factbook, unless otherwise indicated.
Total population is reported as 41.07 million as of July 2011.
Like the demographics of Africa in general, Kenya is plagued by high infant mortality, low life expectancy, malnourishment (32%of population) and HIV/AIDS. While these concerns remain grave, a trend towards improvement is reported in the period of 2006 to 2010: Infant mortality was at estimated at 59.26 deaths/1,000 live births as of 2006, decreasing to 54.7 deaths/1,000 live births as of 2010. Life expectancy was estimated at 48.9 years as of 2006, and has risen to 64 years in 2012.
According to 2008-09 Kenyan government survey, total fertility was 4.6 with contraception usage rate among married women was 46 percent. Total fertility rate has decreased slightly, from 4.91 children born per woman (2006 estimate), to a value of 4.38 (2010 estimate). Literacy (age 7 and over can read and write) was estimated at 85.1% in 2003 (male: 90.6%, female: 79.7%).