Background: Affective disorders occur commonly in postpartum period, ranging in severity from mild and transient “baby blues” experienced by 50–80 % of women to postpartum psychosis which affects <1 % of women . Postpartum major depression lies along this spectrum of postnatal mood disorder. The debilitating effects of postpartum depression (PPD) can involve an entire family, and women afflicted with PPD are at high risk for recurrent depression. Majority of them exhibit symptoms by 6 week postpartum and if not treated, many women continue to be depressed at the end of the first postpartum year. Despite its serious consequences and amenity to treatment, PPD often remains unrecognized. Numerous studies carried out in developed countries provide compelling evidence that postnatal depression is associated with long term emotional, cognitive, and intellectual problems in children Materials & Methods: Non-experimental exploratory descriptive research designed is used to conduct the study. Non-Probability Purposive sampling technique was used to select the samples and Sample size was 140 postnatal mothers. Edinburgh Postnatal depression scale, standardized research tool and self structured risk factors questionnaires were used for data collection. The reliability of research tool is 0.75, which is reliable. Result: The study results showed the majority of samples (60%) 84 postnatal mothers is having mild depression, (22%) 31 postnatal mothers are having moderate depression and (18%) 25 postnatal mothers are having severe depression. Chi square was calculated to analyzed the association between the prevalence and risk factors of postnatal depression among postnatal mothers findings revealed that there was significant association between prevalence and risk factors with complications during pregnancy, self history of depression, family history of depression and condition of baby It emphasizes that the planned teaching programme on postnatal depression prevention, care and treatment can reduce the prevalence of postnatal depression. It may minimize the complications and reduce the morbidity rate due to postnatal depression. Keywords: Postnatal Depression, Prevalence, Risk factors, Postnatal mothers