Based on the 2007 Census conducted by the Central Statistical Agency of Ethiopia, this Zone has a total population of 1,350,415, of whom 671,538 are men and 678,877 women; with an area of 10,833.19 square kilometers, West Welega has a population density of 124.66. While 146,672 or 7.39% are urban inhabitants, a further 2,578 or 0.19% are pastoralists. A total of 266,773 households were counted in this Zone, which results in an average of 5.06 persons to a household, and 250,473 housing units. The three largest ethnic groups reported in West Welega were the Oromo, the Mao, and the Amhara ; all other ethnic groups made up 0.63% of the population. Oromiffa was spoken as a first language by 97.06%, 1.36% spoke Mao, and 21.15% Amharic; the remaining 0.43% spoke all other primary languages reported. The majority of the inhabitants professed Protestantism, with 54.55% of the population having reported they practiced that belief, while 24.19% of the population practiced Ethiopian Orthodox Christianity and 18.66% were Muslim. The 1994 national census reported a total population for this Zone of 1,547,075 in 289,555 households, of whom 766,461 were men and 780,614 women; 132,525 or 8.57% of its population were urban dwellers at the time. The three largest ethnic groups reported in West Welega were the Oromo, the Amhara, and the Mao ; all other ethnic groups made up 0.67% of the population. Oromiffa was spoken as a first language by 76.68%, 22.24% Amharic, and 0.67% spoke Mao; the remaining 0.41% spoke all other primary languages reported. The majority of the inhabitants professed Ethiopian Orthodox Christianity, with 44.03% of the population having reported they practiced that belief, while 37.28% of the population said they were Protestant, 16.88% were Muslim, and 1.1% were Catholic. According to a May 24, 2004World Bank memorandum, 7% of the inhabitants of West Welega have access to electricity, this zone has a road density of 38.5 kilometers per 1000 square kilometers, the average rural household has 1.2 hectare of land and the equivalent of 0.8 heads of livestock. 20.7% of the population is in non-farm related jobs, compared to the national average of 25% and a Regional average of 24%. Concerning education, 71% of all eligible children are enrolled in primary school, and 29% in secondary schools. Concerning health, 87% of the zone is exposed to malaria, and 71% to Tsetse fly. The memorandum gave this zone a drought risk rating of 369.