Categories Statistics What was the population when the United States was established? There were about 2.5 million people living in the United States’ original 13 States in 1776. Post author By Mike P. Sinn Post date May 22, 2019 The U.S. Census Bureau estimates that there were about 2.5 million people living in the United States’ original 13 States in 1776. Sources https://overflow.solutions/mobile/how-has-the-population-total-in-the-u-s-changed-since-1776/ Post author By Mike P. Sinn Tags us population ← Has political power become more decentralized over time? → What is the cause of the opioid crisis?