Research has shown there has been a lack of research on the relationships between interagency collaboration in transition planning and individuals with disabilities successful transition outcomes. In addition, there has been a lack of consistent and updated literature that researches on deaf and hard-of-hearing adolescents’ and transition. As a result of the gap in literature and lack thereof, the researcher conducted a study that expanded the transition literature and contributed to the fields of special education, deaf education and counseling. Collectively the research indicates that education and employment outcomes for deaf and hard-of-hearing adolescents have been quite cumbersome, a clear picture cannot be formed without understanding what correlates to successful transition outcomes. A non-experimental correlational research design explored the differences between participants from residential high schools with post transition programs and residential schools without post transition programs with regard to their perceptions of the relationship between interagency collaboration involving school counselors in transition planning and deaf and hard-of-hearing adolescents’ successful transition outcomes using Bronfenbrenner’s Ecological Model and Social Influence Model as a theoretical scaffold to base the research. The data was collected through the use of written questionnaires developed by the researcher. The researcher accurately analyzed the data into two sections: first section utilized descriptive statistics to compute means, medians, frequencies and percentages and the second section utilized inferential statistical analysis through independent samples t-test to address the research questions.