The crystal structure of the title compound, C5H6ClN2+·H2PO4−, can be described as a stacking of 3‐amino‐2‐chloropyridinium cations and dihydrogenphosphate anions. As well as electrostatic van der Waals interactions, the component species interact by means of multiple hydrogen bonds. The H2PO4− units are linked into polymeric chains propagating along the c axis by way of O—H...O hydrogen bonds. The organic cations are anchored between planes parallel to ac, linking the chains into a three‐dimensional network.

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In the title compound, C7H10N+·H2PO4 −·H3PO4, there is a clear distinction between the P—O/P=O and P—OH bond lengths. In the crystal, the H2PO4 − anions and H3PO4 mol­ecules are linked by O—H⋯O hydrogen bonds, leading to layers propagating in the bc plane. The organic cations are located between these layers and inter­act with them by way of N—H⋯O hydrogen bonds.

The structure of the title compound, C7H9ClN+·H2PO4 −, contains inorganic layers built by (H2PO4)− anions and which are parallel to the ab planes around z = . 3-Chloro-2-methyl­anilinium cations are anchored between the inorganic layers through N—H⋯O hydrogen bonds. Electrostatic and van der Waals inter­actions, as well as hydrogen bonds, maintain the structural cohesion.