| Kallipoleos Street | 18450, 18454 | Nikaia Attica | Attica |
| Kamperidi Savva Street | 18451 | Nikaia Attica | Attica |
| Kanari Konstantinou Street | 18451 | Nikaia Attica | Attica |
| Kantakouzinou Street | 18450 | Nikaia Attica | Attica |
| Kapodistria Ioanni Street | 18454 | Nikaia Attica | Attica |
| Kapsali 1 Byway | 18450 | Nikaia Attica | Attica |
| Kapsali Christou Street | 18450 | Nikaia Attica | Attica |
| Karaiskaki Georgiou Street | 18450, 18454 | Nikaia Attica | Attica |
| Karakoulouxi Dimitriou Street | 18450 | Nikaia Attica | Attica |
| Karaoli & Dimitriou 1 Byway | 18450 | Nikaia Attica | Attica |
| Karaoli & Dimitriou 10 Byway | 18453 | Nikaia Attica | Attica |
| Karaoli & Dimitriou 12 Byway | 18453 | Nikaia Attica | Attica |
| Karaoli & Dimitriou 13 Byway | 18450, 18453 | Nikaia Attica | Attica |
| Karaoli & Dimitriou 14 Byway | 18450, 18453 | Nikaia Attica | Attica |
| Karaoli & Dimitriou 3 Byway | 18450 | Nikaia Attica | Attica |
| Karaoli & Dimitriou 4 Byway | 18450, 18453 | Nikaia Attica | Attica |
| Karaoli & Dimitriou 5 Byway | 18450, 18453 | Nikaia Attica | Attica |
| Karaoli & Dimitriou 6 Byway | 18450 | Nikaia Attica | Attica |
| Karaoli & Dimitriou 7 Byway | 18453 | Nikaia Attica | Attica |
| Karaoli & Dimitriou 8 Byway | 18450, 18453 | Nikaia Attica | Attica |
| Karaoli & Dimitriou 9 Byway | 18453 | Nikaia Attica | Attica |
| Karaoli & Dimitriou Street | 18450, 18453 | Nikaia Attica | Attica |
| Karatheodori Konstantinou Street | 18451 | Nikaia Attica | Attica |
| Karava Street | 18452 | Nikaia Attica | Attica |
| Karezi Tzenis Street | 18452 | Nikaia Attica | Attica |
| Karkavitsa Andrea Street | 18451 | Nikaia Attica | Attica |
| Karvalis Street | 18450 | Nikaia Attica | Attica |
| Kastamonis Street | 18450, 18451 | Nikaia Attica | Attica |
| Kato Polemidion Kyprou Avenue | 18452 | Nikaia Attica | Attica |
| Katsantoni Antoni Street | 18452 | Nikaia Attica | Attica |
| Katsoni Lamprou 1 Byway | 18757 | Nikaia Attica | Attica |
| Katsoni Lamprou 2 Byway | 18757 | Nikaia Attica | Attica |
| Katsoni Lamprou Street | 18451 | Nikaia Attica | Attica |
| Kavalas Street | 18453 | Nikaia Attica | Attica |
| Kazakidi Stylianou Street | 18451 | Nikaia Attica | Attica |
| Kazantzaki Nikou Street | 18452 | Nikaia Attica | Attica |
| Kechagia Gianni Street | 18452 | Nikaia Attica | Attica |
| Kekropos Street | 18454 | Nikaia Attica | Attica |
| Kentavron Street | 18451 | Nikaia Attica | Attica |
| Kerameikou 1 Byway | 18451 | Nikaia Attica | Attica |