Inclusion selectivities of the cyanocadmate host complexes with ammonium oniums, [Cd_(x)(CN)_(2x)][onium zG] (onium = NMe₃Et＾(+), NMeEt₃＾(+) and NEt₄＾(+), G = guest), have been investigated for C_(6)H_(6) (B), PhMe (T), PhEt (E), ortho (0), meta (M), and para (P) isomers of C_(6)H₄Me₂ as the aromatic guest molecules. From the binary, ternary, quaternary and quinary mixed guests of B, T, E, O, M and P, the order of preference in the NMe₃Et+-host is B》T＞P≒O≒ M and E＞0》P≒M; in the NMeEt₃＾(+)-host is T>B>P》O≒M and E＞P》M>O; in the NEt₄＾(+)-host is B>TO=MP. However, the NEta`-host complexes of E, O, M and P mixed-guests were not obtained. These inclusion selectivities were compared to our previous results of the NMe₄＾(+)-host; T＞B＞P》M＞O and E＞P》M＞O.