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Bözen (Swiss German: ˈbøːtsə) is a village in the Swiss canton of Aargau. It lies to the west of the Bözberg in the upper Frick valley. Until December 31, 2021, Bözen was an independent municipality in the district of Brugg, since then it has been one of four villages in the newly created municipality of Böztal in the district of Laufenburg.

Hornussen is a former municipality in the district of Laufenburg in the canton of Aargau in Switzerland. On 1 January 2022 the former municipalities of Bözen, Effingen, Elfingen and Hornussen merged into the new municipality of Böztal.

Effingen is a former municipality in the district of Brugg in canton of Aargau in Switzerland. On 1 January 2022 the former municipalities of Bözen, Effingen, Elfingen and Hornussen merged into the new municipality of Böztal.

Böztal is a municipality in the district of Laufenburg in the canton of Aargau in Switzerland. It was established on 1 January 2022 with the merger of the municipalities of Bözen, Effingen, Elfingen and Hornussen.

Herznach-Ueken is a municipality in the district of Laufenburg in the canton of Aargau in Switzerland. It was established on 1 January 2023 with the merger of the municipalities of Herznach and Ueken.

Ueken is a former municipality in the district of Laufenburg in the canton of Aargau in Switzerland. On 1 January 2023 the former municipalities of Herznach and Ueken merged to form the new municipality of Herznach-Ueken.

Herznach is a former municipality in the district of Laufenburg in the canton of Aargau in Switzerland. On 1 January 2023 the former municipalities of Herznach and Ueken merged to form the new municipality of Herznach-Ueken.

Ittenthal was a municipality in the district of Laufenburg in the canton of Aargau in Switzerland. On 1 January 2010, Ittenthal merged into the municipality of Kaisten.The historical population is given in the following table:

Elfingen is a former municipality in the district of Brugg in canton of Aargau in Switzerland. On 1 January 2022 the former municipalities of Bözen, Effingen, Elfingen and Hornussen merged into the new municipality of Böztal.

The Bözberg Rail Tunnel is a railway tunnel in the Swiss canton of Aargau. It takes the Bözberg railway line of the Swiss Federal Railways under the Bözberg Pass between Effingen and Schinznach-Dorf. The original tunnel was opened during 1875; it is set to be closed to rail traffic during 2020-2021 following the commissioning of its replacement, after which it shall be converted and retained for service and rescue purposes in respect to its successor. During March 2016, construction commenced on the new Bözberg Tunnel, which runs roughly parallel to its predecessor. It is a considerably wider and longer tunnel, being able to accommodate trains up to a height of 4 metres (13 ft). The reason for its construction is to better accommodate larger and heavier freight trains. The second Bözberg Rail Tunnel is scheduled to be opened during 2020.

The Fricktal ("Frick Valley") is a region on Northwestern Switzerland, comprising the Laufenburg and Rheinfelden districts of the Swiss canton of Aargau. The region was known as Frickgau in the medieval period, ultimately from a Late Latin [regio] ferraricia, in reference to the iron mine located here in the Roman era, also transferred to the village of Frick as the main settlement.Frickgau was part of Breisgau within Further Austria in the early modern period. It was joined to Switzerland only during the Napoleonic period. It now forms a northwestern extension to the canton of Aargau to the east of Basel, between the High Rhine forming the border with Germany in the north and the Jura Mountains in the south.

The Bözberg Road Tunnel is a motorway tunnel in Switzerland. The tunnel lies under the Bözberg Pass between Frick and Baden, in the canton of Aargau, and forms part of the A3 motorway from Basel to Sargans. It is 3,705 metres (12,156 ft) long, and was opened in 1996.The tunnel runs roughly parallel to the Bözberg Rail Tunnel.