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Bettenhausen is a municipality in the Oberaargau administrative district in the canton of Bern in Switzerland. On 1 January 2011, the former municipality of Bollodingen was merged with Bettenhausen.

Bollodingen is a former municipality in the Oberaargau administrative district in the canton of Bern in Switzerland. On 1 January 2011 it was merged with the municipality of Bettenhausen.

Ochlenberg is a municipality in the Oberaargau administrative district in the canton of Bern in Switzerland.

The Oberaargau is the region that encompasses the upper watershed of the Aar River in the canton of Bern in Switzerland. On the north, lie the Jura Mountains, and on the south the hills leading to the Emmental. Administratively, the Oberaargau forms a district within the region Emmental-Oberaargau of the canton of Bern. Historically (until 2009), the Oberaargau comprised the two administrative districts of Wangen and Aarwangen.

Bleienbach is a municipality in the Oberaargau administrative district in the canton of Bern in Switzerland.

Oberönz was a municipality in the district of Wangen in the canton of Bern in Switzerland. On January 1, 2008, the municipality of Oberönz became part of the municipality of Herzogenbuchsee.

Herzogenbuchsee is a municipality in the Oberaargau administrative district in the canton of Bern in Switzerland. The population is 7055 (2011), counting the villages in the Oberaargau. The traditional name was Buchsi.

Thunstetten is a municipality in the Oberaargau administrative district in the canton of Bern in Switzerland.

Leimiswil is a former municipality in the Oberaargau administrative district in the canton of Bern in Switzerland. On 1 January 2011 Kleindietwil and Leimiswil were merged with the municipality of Madiswil.

Herzogenbuchsee railway station (German: Bahnhof Herzogenbuchsee) is a railway station in the municipality of Herzogenbuchsee, in the Swiss canton of Bern. It is an intermediate stop on the standard gauge Olten–Bern line of Swiss Federal Railways.

Thunstetten Castle is a castle in the municipality of Thunstetten of the Canton of Bern in Switzerland. It is a Swiss heritage site of national significance.

Wanzwil is a municipality in the district of Wangen in the canton of Bern in Switzerland. On January 1, 2009, the municipalities of Wanzwil and Röthenbach bei Herzogenbuchsee became part of the municipality of Heimenhausen.