| Karatheodori Konstantinou Street | 11525 | Athens | Attica |
| Karatza Ioanni Street | 11741 | Athens | Attica |
| Karavia Evgeniou Street | 11144, 11254 | Athens | Attica |
| Karditsas Street | 10440 | Athens | Attica |
| Karea Byway | 11636 | Athens | Attica |
| Karea Street | 11636 | Athens | Attica |
| Karer Street | 11743 | Athens | Attica |
| Karitainis Street | 10445 | Athens | Attica |
| Karkavitsa Andrea Street | 11141 | Athens | Attica |
| Karkisias Street | 11142 | Athens | Attica |
| Karneadou Street | 10675, 10676 | Athens | Attica |
| Karolidou Pavlou Street | 11476 | Athens | Attica |
| Karolou Street | 10437 | Athens | Attica |
| Karori Street | 10551 | Athens | Attica |
| Karpathou Street | 11252 | Athens | Attica |
| Karpenisioti Athanasiou Street | 11476, 11524 | Athens | Attica |
| Karpenisiou Street | 10443 | Athens | Attica |
| Karpou Street | 11631, 11743, 11744 | Athens | Attica |
| Kartali Street | 11528 | Athens | Attica |
| Karterias Street | 11364 | Athens | Attica |
| Karthaiou Street | 11255 | Athens | Attica |
| Karyatidon Street | 11742 | Athens | Attica |
| Karydi Sofokli Street | 11851 | Athens | Attica |
| Karyofylli Ioanni Street | 11527 | Athens | Attica |
| Karyon Street | 10447 | Athens | Attica |
| Karyotaki Kosta Street | 11141 | Athens | Attica |
| Karyou Andrea Street | 11363 | Athens | Attica |
| Karystou Street | 11523, 11524 | Athens | Attica |
| Karytsi Street | 10561 | Athens | Attica |
| Kasnezi Street | 11744 | Athens | Attica |
| Kasomouli Nikolaou Street | 11743, 11744, 11745 | Athens | Attica |
| Kasou Street | 11364 | Athens | Attica |
| Kassandras Street | 10447 | Athens | Attica |
| Kassaveti Street | 11253 | Athens | Attica |
| Kassianis Street | 11471 | Athens | Attica |
| Kastalias Street | 11363 | Athens | Attica |
| Kastelliou Street | 11141, 11255 | Athens | Attica |
| Kastellorizou Street | 11361 | Athens | Attica |
| Kastorias Street | 10441, 10447 | Athens | Attica |
| Kastrioti Georgiou Street | 11476 | Athens | Attica |