Kos
| Kos Κως | |
|---|---|
| Aerial view of Kos town | |
| Coordinates: 36°51′N 27°14′E / 36.850°N 27.233°E | |
| Country | Greece | 
| Administrative region | South Aegean | 
| Regional unit | Kos | 
| Area | |
|  • Municipality | 295.3 km2 (114.0 sq mi) | 
| • Municipal unit | 67.2 km2 (25.9 sq mi) | 
| Highest elevation | 843 m (2,766 ft) | 
| Lowest elevation | 0 m (0 ft) | 
| Population  (2021) | |
|  • Municipality | 37,089 | 
| • Density | 130/km2 (330/sq mi) | 
| • Municipal unit | 21,430 | 
| • Municipal unit density | 320/km2 (830/sq mi) | 
| Demonym(s) | Koan, Coan | 
| Time zone | UTC+2 (EET) | 
| • Summer (DST) | UTC+3 (EEST) | 
| Postal code | 853 xx | 
| Area code(s) | 2242 | 
| Vehicle registration | ΚΧ, EA | 
| Website | www.kos.gr | 
Kos or Cos (/kɒs, kɔːs/; Greek: Κως [kos]) is a Greek island, which is part of the Dodecanese island chain in the southeastern Aegean Sea. Kos is the third largest island of the Dodecanese, after Rhodes and Karpathos; it has a population of 37,089 (2021 census), making it the second most populous of the Dodecanese after Rhodes. The island measures 42.1 by 11.5 kilometres (26 by 7 miles). Administratively, Kos constitutes a municipality within the Kos regional unit, which is part of the South Aegean region. The principal town of the island and seat of the municipality is the town of Kos.