United States of America Population Pyramid 2018
United States of America in 2018
The population of the United States of America in 2018 was 335,056,498. Over the previous ten years the population grew by 9.9%, up from 304,970,332 in 2008. With a median age of 37.9 years, the United States of America had a youth dependency ratio of 28.5 and an old-age dependency ratio of 23.2 per 100 people of working age. The near-vertical sides of the pyramid indicate a stationary age structure, with births roughly balancing the passage of cohorts into older age.
The bulge of cohorts born between 1946 and 1964 — the post-war baby boom — is the defining feature of the United States pyramid, visible as it moves up the age scale over the decades.
Data source: United Nations World Population Prospects, 2024 revision (medium variant) — last updated July 2024.
