| # | City | Bortle (est.) | Brightness | 2 classes darker |
|---|---|---|---|---|
| 1 | Changhua | 8–9 | 254 | ~25 km WNW |
| 2 | Taoyuan | 8–9 | 255 | ~25 km NNW |
| 3 | Taichung | 8–9 | 255 | ~25 km E |
| 4 | Tainan | 8–9 | 255 | ~25 km WSW |
| 5 | Taipei | 8–9 | 255 | ~25 km SSE |
| 6 | Kaohsiung | 8–9 | 255 | ~25 km WSW |
| 7 | Chiayi City | 8–9 | 255 | ~25 km ESE |
| 8 | Hsinchu | 8–9 | 255 | ~25 km NW |
| 9 | Keelung | 7–8 | 246 | ~25 km NNE |
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.