The Trnava Region is one of the eight Slovak administrative regions. It was established in 1996, before which date, most of its districts were parts of Bratislava Region which was established on the founding of Czechoslovakia in 1923. It consists of 251 municipalities, from which 16 have a town status. It is the second most densely populated region in Slovakia.

The Bratislava Region is one of the administrative regions of Slovakia. Its capital is Bratislava. The region was first established in 1923 and its present borders exist from 1996. It is the smallest of the eight regions of Slovakia as well as the most urbanized, most developed and most productive by GDP per capita.