As of the latest 2007 population census conducted by the Ethiopian national statistics authorities, Addis Ababa has a total population of 2,739,551 urban and rural inhabitants. For the capital city 662,728 households were counted living in 628,984 housing units, which results in an average of 5.3 persons to a household. Although all Ethiopian ethnic groups are represented in Addis Ababa because it is the capital of the country, the largest groups include the Amhara (47.0%), Oromo (19.5%), Gurage (16.3%), Tigrayan (6.18%), Silt'e (2.94%), and Gamo (1.68%). Languages spoken as mother tongues include Amharic (71.0%), Afaan Oromo (10.7%), Gurage (8.37%), Tigrinya (3.60%), Silt'e (1.82%) and Gamo (1.03%). The religion with the most believers in Addis Ababa is Ethiopian Orthodox with 74.7% of the population, while 16.2% are Muslim, 7.77% Protestant, and 0.48% Catholic. 