| # | City | Bortle (est.) | Brightness | 2 classes darker |
|---|---|---|---|---|
| 1 | Sofia | 8–9 | 255 | ~25 km SSE |
| 2 | Plovdiv | 7–8 | 255 | ~25 km SSW |
| 3 | Varna | 7–8 | 255 | ~25 km ESE |
| 4 | Veliko Tŭrnovo | 7–8 | 224 | ~25 km S |
| 5 | Ruse | 7–8 | 220 | ~25 km SW |
| 6 | Haskovo | 7–8 | 251 | ~25 km S |
| 7 | Pazardzhik | 7–8 | 251 | ~25 km SSW |
| 8 | Burgas | 7–8 | 252 | ~25 km E |
| 9 | Sliven | 6–7 | 248 | ~25 km WNW |
| 10 | Stara Zagora | 6–7 | 214 | ~25 km N |
| 11 | Pleven | 6–7 | 253 | ~25 km SSW |
| 12 | Pernik | 6–7 | 180 | ~25 km SW |
| 13 | Asenovgrad | 6–7 | 223 | ~25 km SW |
| 14 | Dobrich | 6–7 | 253 | ~25 km NW |
| 15 | Yambol | 6–7 | 223 | ~25 km N |
| 16 | Shumen | 6–7 | 250 | ~25 km SSW |
| 17 | Blagoevgrad | 6–7 | 246 | ~25 km ENE |
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.