Joniskis's 2026 population is now estimated at 8,249. In 1989, the population of Joniskis was 11,773. Joniskis experienced a decrease of -71 residents over the past year, marking an annual decline of -0.85%. These population values and projections come from Lithuania city census rows via CityPopulation official attribution, World Population Review Internal Projections and Lithuania city estimate rows via CityPopulation official attribution .
| City | 2026 Pop. ↓ | Growth |
|---|---|---|
| Vilnius | 607,842 | 2.16% |
| Kaunas | 302,874 | 0.27% |
| Klaipeda | 160,082 | 1.04% |
| Siauliai | 111,018 | 1.98% |
| Panevezys | 84,392 | -1.08% |
| Alytus | 49,952 | -1.08% |
| Marijampole | 35,681 | -0.58% |
| Mazeikiai | 32,838 | -0.16% |
| Jonava | 26,341 | -0.77% |
| Utena | 25,415 | 0.06% |
| Kedainiai | 23,321 | -0.12% |
| Ukmerge | 21,543 | 0.27% |
| Taurage | 21,463 | 0.24% |
| Telsiai | 21,454 | -1.07% |
| Palanga | 19,198 | 2.77% |
| Visaginas | 18,815 | -0.66% |
| Kretinga | 16,952 | -0.35% |
| Plunge | 16,722 | -0.95% |
| Silute | 15,828 | -0.16% |
| Gargzdai | 15,553 | 0.64% |
| Radviliskis | 15,250 | 0.2% |
| Druskininkai | 12,787 | -0.19% |
| Elektrenai | 12,136 | 1.52% |
| Jurbarkas | 11,236 | 1.98% |
| Rokiskis | 11,103 | -1.16% |
| Kursenai | 10,365 | -1.03% |
| Vilkaviskis | 9,955 | -0.65% |
| Birzai | 9,867 | -1.67% |
| Garliava | 9,768 | -1.18% |
| Grigiskes | 9,713 | -0.48% |
| Lentvaris | 9,373 | -0.71% |
| Raseiniai | 9,348 | -1.07% |
| Prienai | 8,692 | -0.24% |
| Kaisiadorys | 8,347 | -0.08% |
| Joniskis | 8,249 | -0.85% |
| Anyksciai | 8,226 | -1.11% |
| Naujoji Akmene | 8,008 | 0.06% |
| Varena | 7,554 | -1.63% |
| Salcininkai | 7,357 | 1.42% |
| Kelme | 7,109 | -1.55% |
| Pasvalys | 6,205 | -0.77% |
| Kupiskis | 5,859 | -1.18% |
| Trakai | 5,659 | 0.84% |
| Zarasai | 5,579 | -1.69% |
| Sirvintos | 5,472 | -1.25% |
| Moletai | 5,464 | -1.12% |
| Kazlu Ruda | 5,413 | -0.64% |
| Sakiai | 5,184 | -1.03% |
| Skuodas | 5,076 | -1.63% |
| Ignalina | 4,581 | -2.14% |
| Neringa | 4,566 | 4.82% |
| Pabrade | 4,507 | -1.72% |
| Silale | 4,487 | -1.04% |
| Nemencine | 4,379 | -1.95% |
| Pakruojis | 4,349 | -1.09% |
| Svencioneliai | 4,300 | -1.96% |
| Svencionys | 4,159 | -1.33% |
| Vievis | 4,113 | -0.94% |
| Kybartai | 3,869 | -1.28% |
| Kalvarija | 3,822 | -0.8% |
| Lazdijai | 3,698 | -1.65% |
| Rietavas | 3,109 | -0.8% |
| Birstonas | 2,969 | -0.67% |
| Eisiskes | 2,955 | 0.31% |
| Ziezmariai | 2,896 | -1.73% |
| Ariogala | 2,507 | -1.76% |
| Seduva | 2,300 | -1.03% |
| Akmene | 2,217 | -1.2% |
| Venta | 2,151 | -0.88% |
| Vieksniai | 2,066 | -1.67% |
| Rudiskes | 1,851 | -1.39% |
| Tytuvenai | 1,708 | -1.56% |
| Vilkija | 1,646 | -1.38% |
| Ezerelis | 1,563 | -0.95% |
| Pagegiai | 1,511 | -0.85% |
| Gelgaudiskis | 1,474 | -1.27% |
| Skaudvile | 1,321 | -1.56% |
| Kudirkos Naumiestis | 1,275 | -1.62% |
| Zagare | 1,184 | -2.23% |
| Linkuva | 1,179 | -1.67% |
| Salantai | 1,147 | -2.05% |
| Priekule | 1,144 | -1.72% |
| Ramygala | 1,133 | -1.82% |
| Simnas | 1,117 | -2.19% |
| Veisiejai | 999 | -2.63% |
| Baltoji Voke | 987 | -0.2% |
| Jieznas | 987 | -1.2% |
| Joniskelis | 927 | -2.01% |
| Smalininkai | 917 | 1.44% |
| Daugai | 870 | -3.01% |
| Virbalis | 844 | -0.94% |
| Subacius | 840 | -0.71% |
| Varniai | 826 | -1.31% |
| Seda | 796 | -2.45% |
| Vabalninkas | 775 | -2.02% |
| Obeliai | 734 | -3.42% |
| Pandelys | 641 | -1.54% |
| Dukstas | 630 | -2.93% |
| Uzventis | 567 | -1.05% |
| Kavarskas | 465 | -1.48% |
| Dusetos | 441 | -3.71% |
| Troskunai | 359 | -1.64% |
| Panemune | 210 | -0.47% |
