Objectives: To study the clinical profile of patients of hypertension and prehypertension and to study the association of red cell distribution in hypertensive and prehypertensive. Methodology: This was a cross-sectional study total of 150 adult patients admitted in a tertiary care teaching hospital who are willing to participate will be recruited for the study, these patients divided in 3 groups hypertensive, prehypertensive and normal group. All the adult patients >18years who fulfil the criteria of Prehypertension and hypertension as per JNC 8 classification will be enrolled for the study. All patients will be subjected to standardized interview. A detailed history will be taken in each case. All the patients meeting inclusion and exclusion criteria will be evaluated thoroughly. Result: The mean RDW was higher in hypertensive patients (16.1±3.1) compared to prehypertensive patients (14.5±2.0) and normal patients (12.4±0.8). The difference was found statistically significant (p<0.05). Conclusion: In this study shows that higher RDW values are strongly associated with hypertension. RDW is reported in routine Complete hemogram and is therefore easily identified without additional costs.