The seven affected districts are Lakhimpur, Golaghat, Morigaon, Jorhat, Dhemaji, Sivasagar and Kokrajhar.
More than 320 villages are under water in the floods that have snapped surface communication by damaging roads, breached embankments and caused large-scale erosion in many areas, the ASDMA said.
The Brahmaputra is flowing above the danger mark at Nematighat in Jorhat and Dhubri, Dhansiri at Numaligarh in Golaghat, Jia Bhorali at N T Road Crossing in Sonitpur district, Sangkosh in Golakganj and Beki at Road Bridge in Barpeta district.
Over 4,200 people have taken shelter in 24 relief camps and relief distribution centres.