Background Nurses' commitment in the workplace is a psychological state linking them to their organisations. It has been viewed as a dimension of organisational effectiveness. Objectives The purpose of this study was to determine the multiple correlations between the four predictors (job satisfaction, perceived organisational support, transformational leadership behaviour and level of education) on the degree of organisational commitment among nurses in South Florida's long-term care facilities. Method The analytical procedure of multiple regression was utilised to determine the predicting strength among organisational commitment and the independent variables: job satisfaction, perceived organisational support, transformational leadership behaviour and nurses' level of education. To obtain the participants for this study, the researcher chose randomly four nursing homes located in Miami-Dade County. The participants were randomly chosen from a list of nursing staff provided by each facility. Results Pearson product-moment correlation coefficients were computed and revealed that positive correlation existed between nurses' commitment to their organisations, the dependent variable and job satisfaction, perceived organisational support, transformational leadership and level of education, the independent variables. Of the four independent variables, a multiple regression analysis indicated that job satisfaction and perceived organisational support were most strongly related to nurses' commitment to their organisations. Conclusions The study provides new support to previous research about the importance of nurses' commitment and satisfaction for organisational effectiveness and performance. It also provides further evidence that the more commited they are to their organisations, the more they will be productive in their organisations.