High school degree or higher, explained

What it measures

The percentage of adults age 25 and older who have completed at least a high school diploma or equivalent credential (such as a GED). The numerator includes everyone whose highest credential is a high school diploma, an associate's degree, a bachelor's degree, or any graduate or professional degree. The denominator is the population 25 and older. People who completed some high school but never received a diploma or GED are not in the numerator.

This is the floor measure of educational attainment in US data, places where the rate falls below 80% are typically dealing with intergenerational poverty, recent-immigrant populations where adult schooling happened abroad and may not have produced a US-equivalent credential, or both. Above the 90% level, the metric loses most of its discriminating power and the bachelor's-or-higher rate becomes the more informative statistic.

Why it matters

High-school completion is a precondition for almost every entry-level wage job in the modern US labor market. Places with sub-80% high-school-or-higher rates have structurally weaker labor markets, lower labor-force participation, higher unemployment, more reliance on cash and informal-economy work. Federal and state workforce-development programs target areas with low completion rates for adult-education and GED-readiness funding. School districts in low-attainment areas often run intergenerational programs that work with parents alongside their school-age children.

How the Census measures it

Same source as the bachelor's-or-higher figure: ACS Table B15003. CensusEasy sums all attainment categories at or above the "regular high school diploma" level and divides by the population 25 and older. GED and other equivalency credentials are counted in the same numerator. The 5-year ACS is the standard for sub-state geographies; states and the nation are also published annually in the 1-year ACS.

How to read the numbers

The US high-school-or-higher rate is about 89%. The lowest figures are in heavily Hispanic immigrant-receiving areas of South Texas and Southern California (because foreign-born adults with Mexican or Central American schooling are not always credentialed at US-equivalent levels) and in poor rural Appalachian counties. The highest rates are in homogeneous suburban areas of the Mountain West and Upper Midwest. Within a state, the city-suburb gap on this metric is usually smaller than the bachelor's-share gap, central cities can be near or above the state average on high-school completion even when their bachelor's-share lags.

Caveats and limitations

The metric counts US-equivalent credentials, which can understate effective education in immigrant-heavy areas where adults completed secondary school abroad but lack documentation accepted by the Census. It also doesn't distinguish between a recent GED and a forty-year-old high-school diploma, the labor-market value of those credentials differs. Above 90%, the rate becomes essentially saturated and ceases to be a useful comparator between places.