Aargau (pronounced /är-'gou/) was a planet in the Zug system of the Core Worlds region, not far from Coruscant and the Corellian Run. It was run by and served as the headquarters for the Bank of Aargau, which was part of the InterGalactic Banking Clan. Numerous other banks and corporations were also based on Aargau, including the Z-Gomot Ternbuell Guppat Corporation. Aargau was an exceptionally wealthy world, due both to its status as a financial center, as well as the planet's vast reserves of rare and precious metals.
The original native people of Aargau were responsible for beginning construction on the world's many cities. However, by the Galactic Civil War, Humans had become the dominant species on the planet, although, as a major financial hub in the galaxy, thousands of other species were represented.