Banka is one of 243 constituencies of legislative assembly of Bihar. It is part of Banka Lok Sabha constituency along with other assembly constituencies viz. Amarpur, Katoria, Belhar and Dhoraiya. In 2015 Bihar Legislative Assembly election, Banka was one of the 36 seats to have VVPAT enabled electronic voting machines.
Banka comprises CD Blocks Barahat & Banka.