According to the 2021 census, 643,450 people lived in the Athens municipality, making it the largest city in Greece. The second-most populated municipality, Thessaloniki, had approximately 319,050 inhabitants.
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ELSTAT. (May 22, 2025). Largest cities in Greece in 2021, by population (in 1,000 residents) [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 16, 2026, from /statistics/276417/largest-cities-in-greece/
ELSTAT. "Largest cities in Greece in 2021, by population (in 1,000 residents)." Chart. May 22, 2025. ÌÇÐÄÆƽâ°æ. Accessed July 16, 2026. /statistics/276417/largest-cities-in-greece/
ELSTAT. (2025). Largest cities in Greece in 2021, by population (in 1,000 residents). ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 16, 2026. /statistics/276417/largest-cities-in-greece/
ELSTAT. "Largest Cities in Greece in 2021, by Population (in 1,000 Residents)." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 22 May 2025, /statistics/276417/largest-cities-in-greece/
ELSTAT, Largest cities in Greece in 2021, by population (in 1,000 residents) ÌÇÐÄÆƽâ°æ, /statistics/276417/largest-cities-in-greece/ (last visited July 16, 2026)
Largest cities in Greece in 2021, by population (in 1,000 residents) [Graph], ELSTAT, May 22, 2025. [Online]. Available: /statistics/276417/largest-cities-in-greece/
