In this list, we have compiled the 7 smart cities in Germany that have shared out open data in an aggregated open data portal. For the scope of this list, we have included only the open data portals of cities in a country and not the country's national open data portal.

In general, within Europe, more cities in Western Europe have embarked on city-level open data initiatives compared to counterparts in Central and Eastern Europe. The countries with the most open data portals for its major cities in Europe include Italy (13+ city portals), Spain (12+ city portals), France, Germany and United Kingdom (7+ city portals apiece).