Bachelor's Degree Attainment by ZIP Code: Where College Concentrates

Roughly 35% of U.S. adults age 25 and over hold a bachelor's degree or higher. That number is rising about half a percentage point per year and varies enormously by place — from below 10% in some Appalachian counties to above 80% in places like Palo Alto, CA and Cambridge, MA.

What the data captures

Census table B15003 reports the highest degree attained by every U.S. resident age 25+, in 25 categories from 'no schooling completed' through 'doctorate degree.' City Zip Compare aggregates the bachelor's-and-above categories (B15003_022 through B15003_025) into the single 'bachelor's or higher' percentage you see on every place page.

We also report 'high school or higher' (B15003_017 and above) — a useful basic-literacy proxy that ranges from about 75% to 99% across U.S. ZIPs.

Why education concentrates

College graduates cluster around universities, large metros, and high-income suburbs because those are where degree-requiring jobs are. The clustering is self-reinforcing: high local attainment lifts wages, which raises home prices, which excludes lower-income households, which raises attainment further.

This is the single most important variable to control for when comparing places — a high local income may simply reflect that everyone in the ZIP is a college graduate, not that the local labor market is unusually strong.

How to actually use attainment data when comparing places

If you're comparing two ZIP codes with similar median incomes, check educational attainment for both before assuming the local economies are similarly structured. A ZIP with a $85,000 median income and 65% bachelor's attainment likely has a labor market built around professional and knowledge-economy jobs. A ZIP with the same $85,000 median income and 25% attainment likely has a very different mix — possibly skilled trades, energy, or manufacturing work that pays well without requiring a four-year degree.

Neither pattern is better or worse, but they represent genuinely different local economies, with different implications for job availability if you're relocating without a bachelor's degree, or different implications for local wage growth if the area's opportunities are concentrated in degree-requiring fields.

Attainment trends over time, and why they lag

Because ACS5 is a rolling five-year average, a fast-changing ZIP — one experiencing rapid gentrification or a new influx of remote-work professionals — will show its educational attainment shift only gradually in the published data, even if the shift itself happened over a shorter window. If you're evaluating a rapidly changing neighborhood, treat the current attainment figure as a lagging signal of what the ZIP was, on average, over roughly the past five years, not necessarily what it is right now.