Borough 4 (German: Stadtbezirk 4) is a borough of Düsseldorf, the state capital of North Rhine-Westphalia, Germany. It covers an area of 12.62 square kilometres and has about 45,000 inhabitants (2020). Borough 4 is the city's only borough on the west bank of the Rhine and its quarters are popular residential areas. Across the river, it shares borders with Düsseldorf boroughs 5, and 3. West and South-west, the borough is bordered by Rhein-Kreis Neuss and the city of Neuss.