Background Reducing excess body weight is important for control and management of high blood pressure (BP) in adults. Previous studies showed high prevalence of hypertension in River Nile State—north of Sudan, hence this study to establish whether obesity can be among the main risk factors and to study the prevalence of obesity related hypertension among Sudanese adults in River Nile State. Methods This was a cross sectional community-based study conducted in River Nile State, Northern Sudan from January to June 2021. Obese and overweight, aged 18 years and above and accepted to participate in the study were included in the study. Convenience sampling method was used to select the participants. Data was collected through structured questionnaire filled by the patients after taking informed consent. Anthropometric measurements were taken. Two measurements of BP were obtained. Data was analyzed using SPSS version 23.0 (IBM, Chicago, USA). Chi-square test was used to determine the associations between categorical variables while logistic regression test was used to predict the presence of hypertension among studied population. Results A total of 1,295 participants were enrolled in this study. Obesity was reported in 1,118 (86.3%) of the participants. The prevalence of hypertension among the participants was 1,027 (79.3%). Central obesity was reported in 951 (92.6%) among hypertensive patients (P<0.001). Moreover, among hypertensive patients 470 (45.8%) were obese class I, 334 (32.5%) overweight, 139 (13.5%) obese class II and 84 (8.2%) obese class III (P<0.001). Obesity, BMI are risk factor of hypertension (P<0.001). Other risk factors were age above 40 years (P<0.001), unemployment (P<0.001), low education level (P<0.001) and being married (P<0.001). Logistic regression analysis showed that increasing age [P<0.001; odds ratio (OR) =1.055; 95% confidence interval (CI): 1.041–1.068], central obesity (P<0.001; OR =5.16; 95% CI: 3.4–7.8) and high body mass index (BMI) (P<0.001; OR =3.7; 95% CI: 1.7–7.9) were associated with uncontrolled hypertension. Conclusions The study showed that the prevalence of obesity related hypertension was high. Common risk factors were age above 40 years, unemployment, and marriage. Importantly, central obesity, gross obesity and increasing age can be associated with uncontrolled BP management.