The first Census of the United States was conducted on August 2, 1790. The results were used to allocate Congressional seats (congressional apportionment), electoral votes, and funding for government programs.The federal census records for the first census are missing for five states: Delaware, Georgia, Kentucky, New Jersey and Virginia. They were destroyed some time between the time of the census-taking and 1830. The census estimated the population of the United States at 3,929,214, ". . . of which 697,681 were slaves, and . . . the largest cities were New York City with 33,000 inhabitants, Philadelphia, with 28,000, Boston, with 18,000, Charleston, South Carolina, with 16,000, and Baltimore, with 13,000." Digital facsimile from the Hathi Trust at this link.