The purpose of this study was to investigate the personal factors and the relationship between personal factors and marketing mix affecting credit card holders’ selection to apply for additional credit cards. A questionnaire was used as a research instrument to collect data. The sample of this study was 400 individuals. The results of this study indicated that all marketing mix affecting credit card holders’ selection to apply at a high level. When individual aspects were considered, an aspect with the highest mean was process. In addition, when different personal factors were considered, factors with the highest influence on the respondents’ selection to apply for additional credit cards were number of credit cards hold, and occupation. The suggestions of this research included that products should be developed by banks or financial institutions to meet customers’ needs in order to stimulate their existing credit card holders to apply for additional credit cards. Besides, convenient and fast services should be provided.