Stuttgart

The Stuttgart area currently has the highest concentration of scientific, academic, and research organizations in Germany.

An excerpt from the article 20 facts about Stuttgart

No other region in Germany registers as many patents and designs as Stuttgart. Almost 45 percent of Baden-Württemberg's scientists involved in research and development are located in this city.

More than 11 percent of all German R&D costs (research and development costs) are invested in the Stuttgart region (approximately €4.3 billion per year).