Two new salts 2-phenyl imidazolium hydrogen cyclobutane-1,1-dicarboxylate 1, imidazolium hydrogen malonate 2, and two new co-crystals benzimidazole/succinic acid co-crystal (1 ∶ 1) 3 and benzimidazole/isophthalic acid co-crystal (1 ∶ 1) 4 were synthesized and characterized by X-ray crystallography in order to analyze their supramolecular architecture. The results are examined and compared with the structures present in the Cambridge Structural Database.