Background: The prevalence of hypertension in young adults has increased. Hypertension is known to be a leading contributor to many diseases. Purpose: The study aimed to identify factors influencing blood pressure (BP) classification in university students and to establish a basis for the prevention and management of hypertension in young adults. Methods: Four hundred three university students in South Korea were analyzed to determine the factors that influence BP classification. Data were analyzed using the chi-square test, analysis of variance, and multinomial logistic regression. Results: The reference group for the logistic regression analysis included students with normal BP. The odds of being male and of having an overweight or obese body mass index were significantly higher in the prehypertension group than in the normal BP group. The odds of regular (≥ 6 months) exercise habits, having subcutaneous and borderline visceral fat types, and social support were significantly lower in the prehypertension group than in the normal BP group. The odds of being male, being overweight or obese, and having more exercise barriers were significantly higher in the hypertension group than in the normal BP group. The odds of having a high or low economic status were higher and lower in the hypertension group, respectively. Finally, the odds of having subcutaneous or borderline visceral fat types and a vigorous physical activity level were significantly lower in the hypertension group than in the normal BP group. Conclusions: Interventions that address the factors related to BP in young adults are necessary to prevent the occurrence and progression of hypertension in young adults.