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In the title compound, C5H7N2+·C7H5O3−, the carboxylate mean plane of the 4-hydroxybenzoate anion is twisted by 8.78 (5)° from the attached ring. The cations and anions are linked via O—H...O, N—H...O and C—H...O hydrogen bonds, forming a three-dimensional network. In addition, π–π interactions involving the benzene and pyridinium rings, with centroid–centroid distances of 3.5500 (6) and 3.6594 (6) Å, are observed.