In the title compound, C11H11N2O 2S+·NO3 -, the dihedral angle between the benzene and pyridinium rings is 87.59 (8)°. An intra-molecular C - H⋯O inter-action occurs in the cation. In the crystal structure, ion pairs occur, being linked by two strong N - H⋯O inter-actions, forming R 2 2(8) loops. The packing is further stabi...