The aim of the study is evaluation of occurrence of elevated blood pressure values in Wielkopolskie and Mazowieckie provinces. The population studied was a representative sample of children & adolescents age 7-18 (1905 in Mazowieckie and 1805 from Wielkopolskie province). The methodology of BP measurement and classification of hypertension followed the guidelines of the III Report of the Task Force on Blood Pressure Control in Children. The occurrence of elevated BP values were significantly higher in Mazowieckie region.