Gundeldingen is home to 19,224 people, making it the third most populous neighborhood in Basel-Stadt. It covers 1.2 square kilometers, an average-sized area, and is situated between the main train station and the railway tracks to the north and the Bruderholz hill to the south.

The most distinctive finding about Gundeldingen is its exceptionally low share of long-term residents. Only 30.6 percent of its inhabitants have lived there for five years or more, the lowest rate of residential stability in the entire canton. This marks Gundeldingen as Basel's most transient neighborhood, a place of constant movement and change.

Geographically, Gundeldingen sits south of the central station, a position that shapes its character as a transit-oriented district. Its population is notably young: the youth dependency ratio ranks 17th lowest, meaning there are relatively few children compared to working-age adults, while the old-age dependency ratio is the 18th lowest, indicating a very small elderly population. The neighborhood is also highly international, with 42.3 percent foreign nationals, ranking 8th in diversity. Historically, the Gundeldinger Feld lay outside the city walls and was home to manor lords in a quiet, rural setting.

Socially and economically, Gundeldingen presents a mixed picture. The share of single-person households is 29.5 percent, ranking 5th highest, reinforcing the image of a transient, urban lifestyle. The unemployment rate stands at 3.7 percent, and the welfare rate at 4.8 percent, both moderate. However, the Gymnasium attendance rate of 22.5 percent is relatively low, ranking 16th, suggesting fewer academic pathways for local youth. The average apartment size is just 69.6 square meters, and living space per person is 39.4 square meters, both below the city average, reflecting the dense, compact housing stock typical of a central neighborhood.