Reliable population-level estimates of disease prevalence and incidence require accurate population counts. For the Minnesota Electronic Health Record Consortium COVID-19 Project, we used population counts from the US Census American Community Survey (ACS) to report vaccination percentages. However, for some localities and demographic groups the percent vaccinated exceeded 100%, suggesting ACS counts may have limitations for estimating disease prevalence based on medical records, even when those medical records represent an entire state population. 

This report compares population counts from two sources: the 2019 5-year ACS (January 1, 2015 through December 31, 2019) and patient registries at participating MNEHRC sites.