The area is defined as consisting of the municipalities of Rødovre, Hvidovre, Glostrup, Brøndby, Albertslund, Køge, Vallensbæk, Ishøj and Høje-Taastrup and covers the area around some of the stations of the S-train, which are on the lines towards Høje Taastrup and Køge, and which are within the former Copenhagen County.

The urban area of Hundige is often included due to its proximity to the rest of “Vestegnen” and the former terminus on the Køge Bugt-banen, but Hundige is located in Greve Municipality and thus neither in the former Copenhagen County nor the current Capital Region of Denmark.

[1][2][3] The municipalities covered by the former Vestegnssamarbejde (Rødovre, Hvidovre, Glostrup, Brøndby, Albertslund, Vallensbæk, Ishøj and Høje-Taastrup) has a total population of 229,090 people, of which approximately 26.7% have an ethnic background other than Danish, as per 2018.

[8] Just as agriculture came to the area early, it disappeared late, and the villages remained as the primary settlement until World War II.

[9] Thereafter, the area was expanded rapidly to accommodate the growing and increasingly affluent population in the Capital Region of Denmark.