Administrative districts of Serbia

Belgrade is the capital and largest city of Serbia. It is located at the confluence of the Sava and Danube rivers and at the crossroads of the Pannonian Plain and the Balkan Peninsula. , the population of Belgrade city proper stands at 1,197,114, its contiguous urban area has 1,298,661 inhabitants, while population of city's administrative area (which roughly corresponds to its metro area) totals 1,682,720 people. It is one of the major cities of Southeast Europe and the third-most populous city on the river Danube.

level 1 administrative subdivision of the Republic of Serbia

entry for Serbia in ISO 3166-2

Hrtkovci () is a village located in the municipality of Ruma, Serbia. As of the 2011 census, its population is 3,036.