How Many People Have Ever Lived in the United States?

As the nation approaches its two hundred fiftieth anniversary on July Fourth, a demographic analysis from LessWrong examined a sobering milestone: about six hundred forty-four million people have lived in the United States since seventeen seventy-six. Remarkably, just over half of them—fifty-three percent—are alive today. The estimate combines Census records dating back to seventeen ninety with historical birth-rate data and immigration records. Among the findings: of five hundred forty-eight million children born in the US, roughly one in eleven—about forty-nine million—died before age five. Yet had those same children been born under modern conditions, only about three million would have died so young. A stark measure of how far infant survival has come.

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