Lausanne has an area, as of 2009[update], of 65.17 square kilometers (25.16 sq mi).

[4] The age distribution, as of 2009[update], in Lausanne is; 14,278 children or 9.7% of the population are between 0 and 9 years old and 14,983 teenagers or 10.1% are between 10 and 19.

The municipalities of Belmont-sur-Lausanne, Paudex and Pully went to the new District de Lavaux-Oron.

The municipalities of Crissier, Prilly and Renens went to the new District de l'Ouest lausannois.

[7] In the 2007 federal election the most popular party was the SP which received 25.88% of the vote.

In the federal election, a total of 32,749 votes were cast, and the voter turnout was 43.9%.

[8] From the 2000 census[update], 76,732 or 38.3% were Roman Catholic, while 58,655 or 29.3% belonged to the Swiss Reformed Church.

In the Vaud cantonal school system, two years of non-obligatory pre-school are provided by the political districts.

[9] During the school year, the district provided pre-school care for a total of 2,648 children.