Background: Internally Displaced Persons (IDPs) in North Darfur of Sudan have been experiencing serious public health risks such as high prevalence rate, and outbreaks of communicable diseases. Public health risk assessment is complex as researchers engaged in disaster science and management use different quantitative models with different interpretations. The objective of the present study is to proposes methodology for developing Public Health Risk Assessment Model (PH-RAM) to quantify and conceptualizing public health risk as a function of hazard, vulnerability, and capacity.Methods: Household-level public health risk has been assessed integrating the three main component indices, hazard, vulnerability, and capacity, using primary data collected from households of the three IDP camps. Administered survey was performed in 326 households in three IDP camps (Shangil Tobaya, Zamzam, and Abu Shouk) using cluster sampling technique. Households were classified into four public health risk levels, i.e., low risk, moderate risk, high risk, and very high risk. Results: The result shows that the levels of public health risk varied significantly across households in three camps. Households of the Shangil Tobaya camp (in a rural area) were found to be the most vulnerable and the most at high risk to communicable diseases compared to other two camps because of insufficient health services, inadequate water, poor sanitation, and low level of income. The study recommended, mitigation and prevention measures to reduce the factors that are increased the vulnerability of the IDPs to health risks. Conclusions: Our study shows that the suggested PH-RAM could be served as household-level public health risk assessment tools in the context of IDPs at the local, national and regional levels.