Grenzach-Wyhlen is a municipality in the district of Lörrach in Baden-Württemberg, Germany. It is situated on the right bank of the Rhine, 7 km east of Basel, and 8 km south of Lörrach. It has borders to Inzlingen and Rheinfelden (Baden) in Germany, and Riehen (BS), Birsfelden (BL) and Kaiseraugst (AG) in Switzerland.

You can help expand this article with text translated from the corresponding article in German. (February 2009) Click [show] for important translation instructions. View a machine-translated version of the German article. Machine translation, like DeepL or Google Translate, is a useful starting point for translations, but translators must revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia. Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article. You must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation. A model attribution edit summary is Content in this edit is translated from the existing German Wikipedia article at [[:de:Grenzach-Wyhlen]]; see its history for attribution. You should also add the template {{Translated|de|Grenzach-Wyhlen}} to the talk page. For more guidance, see Wikipedia:Translation.

Quick Facts Country, State ...

Grenzach-Wyhlen
Municipality
Town hall in Grenzach
Coat of arms
Location of Grenzach-Wyhlen within Lörrach district
Grenzach-Wyhlen Show map of Germany Grenzach-Wyhlen Show map of Baden-Württemberg
Coordinates: 47°32′42″N 7°40′33″E
Country	Germany
State	Baden-Württemberg
Admin. region	Freiburg
District	Lörrach
Subdivisions	2
Government
• Mayor (2022–30)	Tobias Benz[1] (CDU)
Area
• Total	17.32 km2 (6.69 sq mi)
Elevation	277 m (909 ft)
Population  (2022-12-31)[2]
• Total	15,037
• Density	870/km2 (2,200/sq mi)
Time zone	UTC+01:00 (CET)
• Summer (DST)	UTC+02:00 (CEST)
Postal codes	79639
Dialling codes	07624
Vehicle registration	LÖ
Website	www.grenzach-wyhlen.de

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Grenzach-Wyhlen was established on January 1, 1975 from the two independent municipalities Grenzach and Wyhlen in the course of the Baden-Württemberg reform of the local governments.

First settlements in today's municipality area are of Celtic origin, belonging to the Hallstatt culture in the early 1st millennium BC. The Celtic settlement was followed by Roman settlements and from the 3rd century on by Alemannic ones. The name "Wyhlen" originates in Alemannic "ze wilon", meaning "at the farmstead".

The Roman settlement was called Carantiacum (well of Carantius). From this name today's name Grenzach emerged. In 1982 remains of a Roman villa were excavated. Later on some ruins of an outbuilding were found and archaeologically investigated too. 1991 more walls were found, which were restored and are now visible to the public.

The first documented mentioning of the settlement was in the 13th century CE, when Grenzach and Wyhlen were under Frankish rule. In the late Middle Ages the villages were separated by a national border. Grenzach came to the Margraviate of Baden, while Wyhlen belonged to Further Austria.

In the Thirty Years' War and in later military conflicts the villages suffered severe devastation. With the founding of the Grand Duchy of Baden Wyhlen also became Badisch, so that after more than 500 years the two places were again under the same territorial rule.