It operates bus services between the various communities of this region and, since 2008, in the adjoining municipality of Rapperswil-Jona in the canton of St Gallen.

[1] In the first half of the 20th century, the region between Lake Zürich and the Zürcher Oberland was served by a number of rail lines.

The VZO was founded to operate these replacement service, and over the years more routes in the area were added.

[1][3] The area served includes the municipalities of Bäretswil, Bubikon, Dürnten, Egg, Erlenbach, Fischenthal, Gossau ZH, Grüningen, Herrliberg, Hinwil, Hombrechtikon, Männedorf, Meilen, Mönchaltorf, Oetwil am See, Rapperswil-Jona, Rüti, Seegräben, Stäfa, Uetikon am See, Uster, Wald and Wetzikon.

[4] The Zürichsee and Obersee lakeshore on the northeastern side are also provided by the Verkehrsbetriebe Zürichsee und Oberland, furthermore the local buses within the localities Busskirch, Jona, Kempraten and Rapperswil of the municipality of Rapperswil-Jona in the canton of St. Gallen.