Agiaon is one of 243 constituencies of legislative assembly of Bihar.

Barhara, Arrah, Tarari, Jagdishpur, Shahpur and Sandesh.

[2] Agiaon Assembly constituency comprises:[3] As per the estimates of 2011 census, out of total 352998 population 100% is rural and 0% is urban population.

As per the voter list of 2019, there are 262907 electorates and 276 polling stations in this constituency.

The list of the Members of the Legislative Assembly (MLA) representing Agiaon constituency is as follows: ^By poll