(30,285 sq mi) Capital Dispur Largest city Guwahati District(s) 27 Population • Density 26,655,528 ( 14th )• 340 /km² (881 /sq mi) Language(s) Assamese , Bodo , Bengali ( Barak Valley ) Governor Shiv Charan Mathur Chief Minister Tarun Gogoi Established 1947 - 08-15 Legislature (seats) Unicameral (126) ISO abbreviation IN-AS