|• Mayor||Thomas Grieser (CDU)|
|• Total||73.04 km2 (28.20 sq mi)|
|Elevation||277 m (909 ft)|
|• Density||64/km2 (170/sq mi)|
|Time zone||CET/CEST (UTC+1/+2)|
Oppenau was founded in the 12th century. All Saints' Abbey ("Allerheiligenkloster"), founded in 1192, gained power in 1316, Subsequently Oppenau belonged to the bishops of Strasbourg. After the Reichsdeputationshauptschluss in 1803, Oppenau became part of Baden.
Oppenau's main attractions are the ruins of the monastery, which was destroyed by fire in 1804, and the cataracts close to them.