No...AC to growth rate.... Bhagalpur still 4th pe rahega hi. Ac to me after analysis of growth rate of population and 2011 population...ranks would be
1. Patna
2. Gaya
3. Muzaffarpur
4. Bhagalpur
5....
more... Purnia
6. Biharsharif
7. Begusarai
8. Darbhanga
9. Arrah
10. Katihar
Waise abhi kuch time pehle kuch cities Ka expansion hua hai area me like Bihar Sharif and Begusarai...then changes are possible. 2021 Cencus me clear ho jaayega