

Demographics
Based on the 2007 Census conducted by the Central Statistical Agency of Ethiopia (CSA), Oromia has a total population of 27,158,471, consisting of 13,676,159 men and 13,482,312 women; urban inhabitants number 3,370,040 or 11.3% of the population. With an estimated area of 353,006.81 square kilometers, this region has an estimated population density of 76.93 people per square kilometer. For the entire region 5,590,530 households were counted, which results in an average for the Region of 4.8 persons to a household, with urban households having on average 3.8 and rural households 5.0 people. Ethnic groups include the Oromo (87.8%), Amhara (7.22%), Gurage (0.93% - some of Sebat Bet Gurage, Soddo Gurage, and Silt'e); the remaining 4% constitute other ethnic groups. 47.5% were Muslim, 30.5% Orthodox Christians, 17.7% Protestants, 3.3% followers of traditional religions and 1.1% all other religious groups; in urban areas, Orthodox Christians constitute 51.2% of the population, followed by Muslims at 29.9%, Protestants 17.5%, and all other religious groups at 1.5%. In the previous census, conducted in 1994, the region's population was reported to be 18,732,525, of whom 9,371,228 were men and 9,361,297 women; urban inhabitants number 621,210 or 14% of the population. 44.3% were Muslims, 41.3% Orthodox Christians, 8.6% Protestants, and 4.2% followers of traditional religions. The remaining 1.6% constitute other religious groups; in urban areas, Orthodox Christians constitute 67.8% of the population, followed by Muslims at 24.0%, and Protestants 7%.
The major ethnic groups within the State were the Oromo (85%), Amhara (9.1%), and Gurage (0.98%); 4.6% constitute all other ethnic groups. However figures of full ethnic background are disputed, since many ethnically mixed Ethiopians are difficult to categorize. Particularly, Shewa Oromos and urban Oromos are known to have assimilated with ethnic Amhara and others, while southwestern Oromos have mixed with the Sidama and other ethnicities. For instance, mixed Ethiopians with Oromo father and Amhara mother are registered into the census using only their father's ethnic label. Oromo (Oromiffa), presently written with Latin characters, is the most commonly spoken language, constituting 83.5% of the spoken language. (especially in eastern Welega and northern Shewa), Gurage languages (Sebat Bet Gurage, Soddo, Silt'e), Hadiya, Gedeo (0.98%), especially in western and eastern Shewa; and Tigrigna (0.25%). OmoticAccording to the CSA, as of 2004 , 32% of the total population had access to safe drinking water, of whom 23.7% were rural inhabitants and 91.03% were urban.
Economy
The CSA reported that for 2004-2005 115,083 tons of coffee were produced in Oromia, based on inspection records from the Ethiopian Coffee and Tea Authority. This represents 50.7% of the total production in Ethiopia . Farmers in the Region had an estimated total of 17,214,540 cattle (representing 44.4% of Ethiopia 's total cattle), 6,905,370 sheep (39.6), 4,849,060 goats (37.4%), 959,710 horses (63.25%), 63,460 mules (43.1%), 278,440 asses (11.1%), 139,830 camels (30.6%), 11,637,070 poultry of all species (37.7%), and 2,513,790 beehives (57.73%). According to a March 2003 World Bank publication, the average rural household has 1.14 hectares of land compared to the national average of 1.01 hectares , 24% of the population is in non-farm related jobs compared to the national average of 25%.
Zones
- Arsi Zone
- Bale Zone
- Borena Zone
- Illubabor Zone
- Jimma Zone
- Mirab (West) Hararghe Zone
- Mirab (West) Shewa Zone
- Mirab (West) Welega Zone
- Misraq (East) Hararghe Zone
- Misraq (East) Shewa
- Misraq (East) Welega
- Semien (North) Shewa