Hirzbrunnen is home to 9,663 inhabitants and covers 3.1 square kilometers, making it the second-largest neighborhood in Basel. It lies at the edge of the city, forming the green lung of Kleinbasel thanks to the Lange Erlen forest.

The most distinctive finding about Hirzbrunnen is its extraordinarily high share of green space. With 59.7 percent of its surface covered by parks, forests, and other green areas, it ranks first among all neighborhoods in Basel, far above the city average.

Hirzbrunnen is one of the larger neighborhoods in Basel, ranking second in surface area. Its population of 9,663 places it ninth in size among the city's neighborhoods. The share of foreign nationals is 28.2 percent, which is the 18th lowest in the city, indicating a relatively Swiss-born population. The youth dependency ratio is 37.2, and the old-age dependency ratio is 39.4, both ranking fourth highest in Basel, meaning the neighborhood has a balanced but slightly older demographic structure compared to other areas.

Socially and economically, Hirzbrunnen stands out for its family-oriented character and stability. The share of single-family homes is 69.3 percent, the highest in Basel, and the share of single-person households is only 19.8 percent, the second lowest. The share of long-term residents, or Sesshafte, is 38.4 percent, the fifth highest, reflecting a rooted community. The unemployment rate is low at 2.9 percent, and the share of welfare recipients is 3.8 percent, both below the city average, indicating a relatively prosperous and stable economic environment.

Over time, the share of long-term residents in Hirzbrunnen has remained consistently high, but the most notable trend is the gradual increase in the share of foreign nationals. This suggests that while the neighborhood retains its stable core, it is slowly becoming more diverse.