Thermi's 2026 population is now estimated at 21,694. In 1991, the population of Thermi was 5,265. Thermi has grown by 436 in the last year, which represents a 2.05% annual change. These population values and projections come from CityPopulation Greece agglomerations and isolated cities census series and World Population Review Internal Projections .
| City | 2026 Pop. ↓ | Growth |
|---|---|---|
| Athens | 3,134,884 | -0.07% |
| Thessaloniki | 800,279 | -0.05% |
| Patras | 197,778 | 0.09% |
| Heraklion | 165,237 | 0.32% |
| Larisa | 147,243 | 0.12% |
| Volos | 126,135 | -0.21% |
| Acharnai | 100,905 | 0.01% |
| Chania | 91,027 | 0.19% |
| Ioannina | 89,463 | 0.28% |
| Chalcis | 83,911 | 0.79% |
| Kalamata | 65,406 | 0.62% |
| Agrinion | 62,932 | 0.17% |
| Katerini | 61,912 | 0.12% |
| Trikala | 61,584 | -0.01% |
| Alexandroupolis | 60,326 | 0.28% |
| Xanthi | 60,108 | 0.46% |
| Serres | 58,454 | 0.02% |
| Rhodes | 57,260 | 0.97% |
| Komotini | 52,109 | 0.15% |
| Kavala | 50,939 | -0.39% |
| Lamia | 45,442 | -0.89% |
| Drama | 42,775 | -0.31% |
| Kozani | 42,686 | 0.26% |
| Veria | 42,190 | -0.15% |
| Corfu | 39,846 | 0.09% |
| Karditsa | 39,219 | 0.11% |
| Rethymno | 38,045 | 0.42% |
| Chios | 35,870 | 0.07% |
| Ano Liosia | 35,811 | 0.43% |
| Salamina | 33,926 | -0.54% |
| Mytilene | 33,830 | 1.3% |
| Aspropyrgos | 31,960 | 0.37% |
| Ptolemaida | 31,245 | -0.19% |
| Corinth | 31,143 | 0.21% |
| Tripoli | 30,143 | -0.16% |
| Yannitsa | 28,255 | -0.35% |
| Megara | 26,536 | 0.82% |
| Aigion | 26,337 | -0.06% |
| Pyrgos | 25,558 | 0.32% |
| Eleusis | 25,005 | 0.03% |
| Oraiokastron | 23,667 | 0.85% |
| Kilkis | 23,314 | 0.12% |
| Kos | 22,503 | 0.98% |
| Artemida | 22,142 | 0.2% |
| Arta | 21,751 | -0.05% |
| Thermi | 21,694 | 2.05% |
| Levadeia | 21,514 | 0.04% |
| Argos | 21,102 | -0.34% |
| Thebes | 20,907 | -0.6% |
| Koropi | 20,662 | 0.51% |
| Sparta | 19,541 | 0.21% |
| Preveza | 19,442 | 0.14% |
| Orestiada | 18,030 | -0.14% |
| Pallini | 17,870 | 0.57% |
| Nea Makri | 17,622 | 0.84% |
| Naousa | 17,328 | -0.57% |
| Florina | 16,946 | -0.28% |
| Amalias | 16,882 | 0.05% |
| Edessa | 16,665 | -0.6% |
| Peraia | 16,273 | -0.87% |
| Kalyvia Thorikou | 16,041 | 0.71% |
| Paiania | 15,443 | 0.38% |
| Alexandreia | 15,154 | 0.15% |
| Ermoupolis | 14,951 | -0.39% |
| Nafplio | 14,699 | 0.23% |
| Rafina | 14,386 | 1.12% |
| Ierapetra | 14,281 | 0.97% |
| Kalymnos | 14,173 | 0.93% |
| Gazi | 14,009 | 0.7% |
| Nafpaktos | 12,728 | -0.35% |
| Loutraki | 12,551 | 0.54% |
| Agios Nikolaos | 12,532 | 0.63% |
| Missolonghi | 12,272 | -0.28% |
| Kastoria | 12,150 | -0.65% |
| Grevena | 11,893 | -0.66% |
| Sitia | 11,230 | 1.23% |
| Mandra | 11,027 | -0.18% |
| Porto Rafti | 10,974 | 0.84% |
| Markopoulon | 10,860 | 0.89% |
| Agios Stefanos | 10,805 | 0.59% |
| Diavata | 10,365 | 0.32% |
| Argostoli | 10,308 | 0.37% |
| Tyrnavos | 9,542 | -0.99% |
