Sources and Reference

 Data on this page come from the U.S. Census Bureau’s 2018 Population Estimates, 2018 International Trade Statistics, 1790 Census: Whole Numbers of Persons within the District of the U.S. report, Historical Statistics of  the United States: 1789–1945 report. Fourth of July Facts for Features. My Congressional District, U.S. Population Clock, and 2016 County Business Patterns.