Weisbaden Germany, Wiesbaden, a city in central Germany, is the capital of the state of Hesse. The city is on the right, northern, bank of the river Rhine. It lies opposite the city of Mainz on the other side of the river, and is near Frankfurt am Main. Wiesbaden has about 300,400 inhabitants, plus approximately 14,000 U.S. citizens (mostly associated with the American military). The city is also in the Rhein Metropolitan area with Frankfurt and Mainz put together with it, consisting of about 5.8 million people