Ouest Lausannois has an area, as of 2009[update], of 26.35 square kilometers (10.17 sq mi).

[3] The age distribution, as of 2009[update], in Ouest Lausannois is; 7,417 children or 11.2% of the population are between 0 and 9 years old and 7,415 teenagers or 11.2% are between 10 and 19.

In the federal election, a total of 12,329 votes were cast, and the voter turnout was 41.5%.

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

[7] During the school year, the district provided pre-school care for a total of 803 children.