| # | City | Bortle (est.) | Brightness | 2 classes darker |
|---|---|---|---|---|
| 1 | Seoul | 8–9 | 255 | ~50 km ENE |
| 2 | Incheon | 8–9 | 255 | ~25 km SW |
| 3 | Suwon | 8–9 | 255 | ~50 km WSW |
| 4 | Goyang-si | 8–9 | 252 | ~25 km NW |
| 5 | Seongnam-si | 8–9 | 255 | ~25 km E |
| 6 | Osan | 8–9 | 255 | ~25 km ESE |
| 7 | Daegu | 8–9 | 255 | ~25 km NNE |
| 8 | Uijeongbu-si | 8–9 | 255 | ~25 km ENE |
| 9 | Pyeongtaek | 8–9 | 255 | ~25 km SE |
| 10 | Daejeon | 8–9 | 255 | ~25 km SSW |
| 11 | Kimhae | 8–9 | 255 | ~25 km S |
| 12 | Changwon | 8–9 | 255 | ~25 km SSW |
| 13 | Busan | 8–9 | 255 | ~25 km S |
| 14 | Hwaseong-si | 8–9 | 230 | ~25 km WSW |
| 15 | Ulsan | 8–9 | 255 | ~25 km ENE |
| 16 | Cheonan | 8–9 | 255 | ~25 km SSW |
| 17 | Cheongju-si | 8–9 | 252 | ~25 km ENE |
| 18 | Gwangju | 8–9 | 255 | ~25 km SE |
| 19 | Gumi | 8–9 | 251 | ~25 km NNE |
| 20 | Yangsan | 8–9 | 254 | ~25 km NNW |
| 21 | Jeonju | 7–8 | 255 | ~25 km ENE |
| 22 | Sejong | 7–8 | 236 | ~25 km W |
| 23 | Pohang | 7–8 | 255 | ~25 km NE |
| 24 | Iksan | 7–8 | 255 | ~25 km NNW |
| 25 | Yeosu | 7–8 | 250 | ~25 km SSW |
| 26 | Gyeongju | 7–8 | 255 | ~25 km SW |
| 27 | Mokpo | 7–8 | 254 | ~25 km WNW |
| 28 | Gangneung | 7–8 | 254 | ~25 km NNE |
| 29 | Jeju City | 7–8 | 249 | ~25 km NNW |
| 30 | Gunsan | 7–8 | 211 | ~25 km WNW |
| 31 | Suncheon | 7–8 | 247 | ~25 km S |
| 32 | Chinju | 7–8 | 239 | ~25 km W |
| 33 | Chungju | 7–8 | 255 | ~25 km ESE |
| 34 | Wŏnju | 7–8 | 255 | ~25 km E |
| 35 | Chuncheon | 7–8 | 255 | ~25 km NNE |
| 36 | Geoje | 6–7 | 164 | ~25 km S |
Brightness is the NASA VIIRS Black Marble 2016 value at the city centre on a 0–255 scale; 255 is saturated. Cities are ordered by estimated sky brightness, which also counts the light within 30 km.