Kostajnik
Kostajnik is a village in Serbia. It is situated in the Krupanj municipality, in the Mačva District of Central Serbia. Kostajnik is notable for being a fortified village since 1445. The village had a Serb ethnic majority and a population of 1,048 in 2002.
Historical population
- 1948: 1,431
- 1953: 1,621
- 1961: 1,671
- 1971: 1,506
- 1981: 1,364
- 1991: 1,264
- 2002: 1,048