The Dale-Wonsho health and demographic surveillance system is a population cohort in rural southern Ethiopia that collects data on births, deaths, migrations, and immunizations. It consists of 12 administrative units with a population of 69,021 people. The cohort provides valuable data for researchers and policymakers to guide public health initiatives in rural Ethiopia. The document also provides demographic characteristics of the Dale-Wonsho HDSS, including household size, sex ratio, and dependency ratio. It highlights the lower total dependency ratio compared to other sites in Ethiopia, potentially due to lower fertility rates. The document acknowledges the support and funding received from various organizations. [Extracted from the article]