Dodoma (literally "It has sunk" in Gogo), officially Dodoma Urban District, population 324,347 (2002 census), is the national capital of Tanzania, and the capital of the Dodoma region. In 1973, plans were made to move the capital to Dodoma. Tanzania's National Assembly moved there in February 1996, but many government offices remain in the previous national capital, Dar es Salaam, which remains the commercial capital. Located at 6°1023S 35°4431E / 6.17306°S 35.74194°E / -6.17306; 35.74194, in the centre of the country, the town is 486 kilometres (302 mi) west of the former capital at Dar es Salaam and 441 kilometres (274 mi) south of Arusha, the headquarters of the East African Community. It covers an area of 2,669 square kilometres (1,031 sq mi) of which 625 square kilometres (241 sq mi) is urbanized. Out of the total population, 157,469 people (48.5 percent) are male while 166,878 people (51.5 percent) are female. The estimated total number of households is 74,914 with an average household size of 4.3 people. The Roman Catholic Church reports that 19.2% of the population are Roman Catholics. Dodoma is populated by different ethnic groups because it is a government administrative centre, although the indigenous ethnic groups are the Gogo, Rangi, and Sandawe. There are also small Arab and Indian minorities. During the German wars, the town of Dodoma was founded at the same time as the construction of the Tanzanian central railway. American architect James Rossant developed a master plan for the new capital in 1986, sponsored by the United Nations.