The county shared borders with the Austrian land of Lower Austria and the Hungarian counties Nyitra (Nitra), Komárom (Komárno), Győr and Moson. It was situated between the river Morava in the west, the river Danube in the south, and the river Váh in the east. The southern part of the Little Carpathians divided the county into two. It also covered most of the island known today as Žitný ostrov (Hungarian: Csallóköz) between the Danube and the Little Danube. Its area was 4,370km² around 1910.
Seats
The seats of Pozsony county were the Pozsony Castle (Bratislava Castle) and Somorja Šamorín, and from the 18th century onwards the town of Pozsony.