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In the title compound, C6H9N2+·C6H4NO2−, the 2-amino-5-methylpyridinium cation is essentially planar, with a maximum deviation of 0.023 (2) Å. In the crystal, the cations and anions are linked via strong N—H...O hydrogen bonds, forming a two dimensional network parallel to (100). In addition, π...π interactions involving the pyridinium and pyridine rings, with centroid–centroid distances of 3.6383 (8) Å, are observed.