531xx

531xx refers to the series of postal codes assigned to the city of Bonn in the federal state of North Rhine-Westphalia, Germany. The full range extends from 53114 to 53129 and covers the central boroughs of the city, including the historic core, the area around the Rhine, and the German federal government's seats that relocated to Bonn after World War II. Bonn was the capital of West Germany from 1949 until 1990 and still hosts many federal ministries and international organizations, which is reflected in the density of addresses within the 531xx zone. The postal code 531xx also includes several well‑known institutions such as the Maximilianstraße, a street renowned for its shopping and cultural venues, and the Beethoven-Haus, the birthplace of the composer Ludwig van Beethoven.

The 531xx area is densely populated, with a mixture of residential, commercial, and diplomatic buildings. It is served by a comprehensive public transport network that includes S-Bahn and regional train stations, as well as multiple bus lines that connect to the surrounding Rhein-Sieg district. The region is also known for its green spaces, such as the Altenberger Schlosspark and the Poppelsdorf Palace gardens, which provide recreational opportunities for residents and visitors.

Because of its historical and political importance, addresses in the 531xx zone are frequently used in diplomatic correspondence and international agreements. The numbering scheme facilitates efficient mail routing and logistics within Bonn and the larger Rhein-Sieg area. The postal code series remains a key identifier for businesses, government agencies, and individuals operating in the city.