Primary healthcare is the backbone of healthcare systems, offering people and families comprehensive and necessary medical services that improve their general health and well-being. This study looked into the factors that influence women in Rivers State’s Rivers East Senatorial District’s use of basic healthcare services. To direct the investigation, three research questions and hypotheses were formulated. With a population of 133,545 women in the Rivers East Senatorial District, a descriptive correlational study methodology was used. A multistage sampling technique was used to choose the sample size of 1596. A standardized questionnaire with a reliability coefficient of 0.80 was used to gather data. The mean and Pearson Product Moment Correlation (PPMC) at the 0.05 alpha level were used for the analysis. This result revealed that, the utilization of PHC services amongst women in Rivers East Senatorial District was determined highly by perceived severity of illness (3.39 ± 0.83); perceived susceptibility to illness (3.55 ± 0.77); and perceived benefits of PHC services (3.39 ± 0.80). The result revealed that, there existed a noteworthy correlation between variables like perceived severity of illness (N = 1549, r = 0.44, p = 0.00); perceived susceptibility to illness (N = 1549, r = 0.51, p = 0.00); perceived benefits of PHC services (N = 1549, r = 0.46, p = 0.00) and primary healthcare services utilization among women in Rivers East Senatorial District. The research concluded that the major determinants of utilization among women in Rivers East senatorial district were behavioural factors such as perceived severity, perceived susceptibility and perceived benefits. Among other things, it was advised that health care workers should educate women on the benefits of utilizing PHC services.