The appendix of the Staatsblad van Nederlandsch-Indie (Supplement of the NI Statutebook) no. 11446 of 30 August 1927 mentions the GBZ at Pekalongan as a hospital with only Nursing Class 4 (f 1,50 per day), meaning that it was a small not very important hospital. It was classified as a Government Civil Hospital or Gouvernements Burgerlijke Ziekeninrichting.

In the 1930s Pekalongan was a Residency, regency and district with a capital with the same name in the province of Central Java. The Residency is very fertile and produces lots of rice. It has many sugar mills and produces coffee, tea and kina as well. The capital Pekalongan has a municipality council and a mayor and has almost 66,000 inhabitants of whom 900 Europeans and 5,400 Chinese. Alongside the coastline a railway connects towns such as Brebes, Tegal, Pemalnag, Pekalongan and Batang (Gonggryp 1934, 1155-1156).