Kostajnica's 2026 population is now estimated at 5,017. In 2013, the population of Kostajnica was 5,977. Kostajnica experienced a decrease of -68 residents over the past year, marking an annual decline of -1.34%. These population values and projections come from BHAS Census 2013 municipality/city totals, Republika Srpska municipality population estimates (mid-2024) and World Population Review Internal Projections .
| City | 2026 Pop. ↓ | Growth |
|---|---|---|
| Sarajevo | 270,585 | -0.14% |
| Banja Luka | 186,482 | 0.06% |
| Tuzla | 106,593 | -0.31% |
| Zenica | 106,151 | -0.32% |
| Mostar | 103,099 | -0.2% |
| Bijeljina | 102,066 | -0.41% |
| Brcko | 83,516 | 0% |
| Ilidza | 74,049 | 0.8% |
| Prijedor | 73,148 | -1.53% |
| Cazin | 63,700 | -0.29% |
| Zivinice | 57,707 | -0.01% |
| Doboj | 55,417 | -1.93% |
| Bihac | 53,938 | -0.32% |
| Zvornik | 50,478 | -1.17% |
| Travnik | 50,425 | -0.45% |
| Gradiska | 44,667 | -1.12% |
| Tesanj | 44,058 | 0.18% |
| Gracanica | 44,053 | -0.2% |
| Lukavac | 41,120 | -0.61% |
| Velika Kladusa | 38,772 | -0.32% |
| Srebrenik | 38,760 | -0.18% |
| Sanski Most | 38,176 | -0.64% |
| Gradacac | 38,174 | -0.23% |
| Visoko | 37,846 | -0.41% |
| Kakanj | 36,027 | -0.3% |
| Laktasi | 34,836 | -0.03% |
| Teslic | 33,908 | -0.98% |
| Zavidovici | 33,843 | -0.47% |
| Kalesija | 31,962 | -0.26% |
| Livno | 31,303 | -0.66% |
| Prnjavor | 30,789 | -1.19% |
| Vogosca | 30,495 | 1.13% |
| Bugojno | 30,346 | -0.28% |
| Tomislavgrad | 29,205 | -0.6% |
| Siroki Brijeg | 29,113 | 0.05% |
| Zepce | 29,095 | -0.29% |
| Trebinje | 28,523 | -0.18% |
| Ljubuski | 26,539 | -0.46% |
| Vitez | 25,575 | -0.08% |
| Jajce | 25,343 | -0.56% |
| Hadzici | 24,598 | 0.22% |
| Derventa | 23,680 | -1.11% |
| Capljina | 23,630 | -0.78% |
| Bosanska Krupa | 23,268 | -0.72% |
| Novi Travnik | 23,079 | -0.25% |
| Konjic | 22,402 | -0.88% |
| Modrica | 22,204 | -1.13% |
| Maglaj | 21,896 | -0.43% |
| Banovici | 21,657 | -0.39% |
| Ilijas | 21,410 | 0.68% |
| Novi Grad | 21,068 | -1.92% |
| Posusje | 20,305 | -0.06% |
| Kiseljak | 19,869 | -0.32% |
| Pale | 19,462 | -0.55% |
| Gornji Vakuf-Uskoplje | 19,062 | -0.72% |
| Buzim | 19,049 | -0.12% |
| Gorazde | 18,702 | -0.85% |
| Orasje | 17,877 | -0.8% |
| Citluk | 17,607 | -0.23% |
| Kozarska Dubica | 17,383 | -1.63% |
| Busovaca | 17,264 | -0.28% |
| Kotor Varos | 17,232 | -1.03% |
| Bratunac | 17,087 | -1.33% |
| Odzak | 16,472 | -1.02% |
| Grude | 16,414 | -0.41% |
| Foca | 15,539 | -1.25% |
| Srbac | 15,021 | -1.2% |
| Kljuc | 14,779 | -0.96% |
| Celinac | 14,374 | -0.6% |
| Brod | 14,191 | -1.2% |
| East Ilidza | 13,894 | -0.47% |
| East New Sarajevo | 13,708 | 1.97% |
| Samac | 13,498 | -1.88% |
| Stolac | 13,484 | -0.56% |
| Donji Vakuf | 13,414 | -0.32% |
| Ugljevik | 13,264 | -1.29% |
| Mrkonjic Grad | 13,223 | -1.77% |
| Breza | 12,600 | -0.9% |
| Prozor-Rama | 12,556 | -0.99% |
| Lopare | 11,932 | -1.92% |
| Nevesinje | 11,051 | -1.22% |
| Fojnica | 10,937 | -0.93% |
| Kladanj | 10,878 | -0.97% |
| Srebrenica | 10,380 | -1.95% |
| Sokolac | 10,360 | -1.14% |
| Sapna | 10,017 | -0.84% |
| Milici | 9,592 | -1.35% |
| Doboj Istok | 9,547 | -0.54% |
| Celic | 9,402 | -0.84% |
| Bileca | 9,345 | -1.11% |
| Vlasenica | 9,283 | -1.61% |
| Jablanica | 9,131 | -0.78% |
| Rogatica | 9,091 | -1.26% |
| Sipovo | 8,513 | -1.45% |
| Olovo | 8,291 | -1.57% |
| Visegrad | 8,213 | -1.99% |
| Gacko | 7,758 | -1.13% |
| Knezevo | 7,248 | -2.28% |
| Stanari | 6,995 | 0% |
| Vares | 6,759 | -2.09% |
| Teocak | 6,736 | -0.75% |
| Rudo | 6,516 | -1.53% |
| Usora | 6,128 | -0.57% |
| Bosanski Petrovac | 5,531 | -2.14% |
| Drvar | 5,272 | -2.19% |
| Sekovici | 5,177 | -2.02% |
| Osmaci | 5,107 | -1.24% |
| Petrovo | 5,098 | -1.83% |
| Kostajnica | 5,017 | -1.34% |
| Kupres | 4,676 | -0.6% |
| Kresevo | 4,627 | -1.01% |
| Ribnik | 4,521 | -2.21% |
| Neum | 4,285 | -0.63% |
| Domaljevac-Samac | 4,197 | -0.99% |
| Doboj Jug | 4,084 | -0.1% |
| Vukosavlje | 4,015 | -1.16% |
| Cajnice | 4,011 | -1.52% |
| Pelagicevo | 3,426 | -3.19% |
| Ravno | 3,214 | 0% |
| Glamoc | 3,117 | -1.64% |
| Donji Zabar | 3,075 | -1.63% |
| Han Pijesak | 2,939 | -1.41% |
| Ljubinje | 2,793 | -1.76% |
| Novo Gorazde/Ustipraca | 2,372 | -2.1% |
| Trnovo (RS) | 1,968 | -0.3% |
| Bosansko Grahovo | 1,912 | -1.9% |
| Ostra Luka | 1,795 | -3.34% |
| Trnovo | 1,735 | 1.11% |
| Foca-Ustikolina | 1,605 | -1.41% |
| Berkovici | 1,591 | -2.15% |
| Dobretici | 1,497 | -0.66% |
| Kalinovik | 1,494 | -2.35% |
| Krupa na Uni | 1,151 | -2.46% |
| East Old Town | 924 | -1.49% |
| Jezero | 888 | -1.88% |
| Pale-Praca | 738 | -1.6% |
| Petrovac | 710 | 5.19% |
| East Mostar | 236 | -0.42% |
| Kupres (RS) | 205 | -2.84% |
| East Drvar | 128 | 4.07% |