What is the Population of Massachusetts November 16, 2017 United States The Population of Massachusetts as per July 1st, 2016 estimate, is 6,811,779 (Six million eight hundred eleven thousand seven hundred seventy-nine). The last official US Government census was done in 2010, and the population as per that census was 6,547,629 (Six million five hundred forty-seven thousand six hundred twenty-nine). Here is a compilation of county-wise population data for the state in tabular format: