The alkyl chain length on alkyl-substituted phthalocyanines (CnOPc) dependence of their self-organized structures was examined in this study. STM results indicated that the symmetry of ordered structures decreased as the alkyl chain became longer, with the exception of C6OPC, which preferentially formed a quasi-3-fold symmetrical structure. This could be explained by the fact that the CnOPc molecules are most likely to form densely packed structures. With CnOPc, when n = 4 to 10, the self-organized structures were dependent on the competition between how densely the molecules were arranged and how loose the intermolecular interaction energy was, caused by the formation of the densely packed structure. However, with CnOPc, when n = 10-18, the molecules tended to form densely packed structures by reducing the symmetry, even though the CnOPc molecules were distorted. When C12OPc and cobalt phthalocyanine were coadsorbed, the mixed system exhibited a four-fold symmetrical structure, which is rarely observed in C12OPC.