Previous research suggests that exposure to persistent organic pollutants (POPs) increases the risk of chronic diseases such as hypertension. We identified the zip codes of more than 800 waste sites contaminated with POPs and other pollutants, based on which we classified zip codes of upstate New York into three groups: "POPs sites", zip codes containing hazardous waste sites with POPs; "other waste sites", zip codes containing hazardous waste sites but not with POPs; and "clean sites", zip codes without any known hazardous waste sites. Age, gender, race, and zip code of residence of patients diagnosed with hypertension (ICD-9 codes 401-404) were identified using the New York Statewide Planning and Research Cooperative System (SPARCS) for the years 1993-2000. A generalized linear model, the negative binomial model, was used to assess the effect of living in a zip code with a hazardous waste site on the discharge rate of hypertension. After control for the aforementioned covariates, we found a statistically significant elevation of 19.2% (95% CI = 8.5%, 31%) in hypertension discharge rate for "POPs sites" and a 10% elevation in discharge rates for "other waste sites" as compared to "clean sites". In a subset of "POPs sites" where people have higher income, smoke less, exercise more and have healthier diets, there was still a 13.9% elevation of hypertension discharge rate as compared to "clean sites". The results support the hypothesis that living near hazardous waste sites, particularly sites containing POPs, may constitute a risk of exposure and of developing hypertension.