Rhein-Sieg-Kreis II is located in southwestern North Rhine-Westphalia. As of the 2021 federal election, it comprises the municipalities of Alfter, Bad Honnef, Bornheim, Königswinter, Meckenheim, Rheinbach, Sankt Augustin, Swisttal, and Wachtberg from the Rhein-Sieg-Kreis district.
