Every summer the US Census Bureau publishes a fresh set of population estimates: how many people live in the country, in each state, in every metropolitan area and county, broken down by age, sex, race and Hispanic origin. The latest set came out on 25 June 2026, and it is the clearest recent picture of who lives in America and where. If you plan campaigns, size markets or define audiences, it is worth ten minutes of your time.
This is public data: figures collected and published by a government agency, free for anyone to use. It is the same source the Treasury, the Federal Reserve and every serious regional planner reach for when they need to know how a population is changing. If it is good enough to underwrite federal funding formulas, it is good enough to underwrite a media plan. For a plain primer on what public data is and where it comes from, we keep one here.
The national headline is steady. The country grew from 331.5 million people in April 2020 to 341.8 million by July 2025, a rise of about 10.3 million, or 3.1% over five years. Underneath that flat-looking total, two things stand out.
First, the country is getting older. The population aged 65 and over grew by nearly 9 million, up 16.2% in five years, by far the fastest-growing age band. The 25 to 44 group grew 5.9%. Meanwhile, the under-18 population fell 2.4%, and the 45 to 64 group fell 3.2%. The median age is now 39.4 years, older for women at 40.7 than for men at 38.1.
Second, growth is not spread evenly. The South grew 6.0% over the five years, nearly double the national rate, and it was the only region where every age group grew. Most of that came from the outlying counties of Southern metropolitan areas rather than the big central cities. For a sense of the range between places, Maine has the oldest population of any state, at a median age of 44.9, and Utah has the youngest, at 32.6.
Numbers like these only earn their keep when you point them at a decision. Say a regional services brand is choosing where to open next in the South-East. The national line that the country is getting older is true, but useless at that level. What matters is the age structure of the specific counties in play, and whether the places that are growing are gaining young families or people heading into retirement, because that changes the product, the message, and the channel.
The release answers exactly that, county by county. The over-65 growth is nationwide, but the family-age growth is concentrated: those outlying Southern metro counties were the only counties in the country to add residents in both the under-18 and 45 to 64 groups. A brand chasing young families and one chasing an older market would read the same map and pick different places. You can put two areas side by side with the county comparison, or browse rankings like the most and least educated counties and the county view of where US chief executives live, to see how far two neighbours can differ.
Three uses come straight off this release. Age structure drives life-stage segmentation: a market skewing older wants different products and different channels from one gaining young families. The race and Hispanic-origin cuts, published in the same release, support an audience definition grounded in who actually lives somewhere rather than an assumption. And county-level resolution means a regional launch can be planned around where the audience really is, not a national average that describes nowhere in particular.
These estimates sit alongside the American Community Survey, the Census Bureau's annual household survey, which fills in the detail behind the headcount: income, education, language spoken at home, commuting, and housing. Together, they are the backbone of US demographic planning. If you want to put the survey to work on a market question, we have a guide to that, and the Bureau's own population estimates programme holds the full tables and visualisations.
The country grew a little, aged a lot, and grew fastest in the South, and none of that is visible from a single national figure. The value is in the cuts: by age, by region, by county.
Cambium AI builds synthetic populations from this same public data, so a research, planning, or marketing team can work with the age, sex and geographic detail behind a decision before the budget is fixed. A population you can trace back to the Census Bureau is the one you can defend when someone asks where the number came from. That is the point of verified public data and a method you can show your work on: it is the insurance policy for a campaign decision. See it in Cambium AI →
Data source: U.S. Census Bureau, Vintage 2025 Population Estimates (release CB26-105, 25 June 2026).