Food Access Topics
Plain-language explainers covering the full range of food access, food desert, SNAP, and transportation concepts used on this site.
Methodology
Each topic explains a concept that appears on the data pages — food desert designation, low-access threshold, SNAP coverage, vehicle availability — and links back to the underlying tables where the number lives. Topics are written to match the terminology used by the USDA Economic Research Service and the Census Bureau, so readers can move between this site, the original datasets, and academic literature without translation friction.
Where research literature is cited, we favor peer-reviewed sources and official USDA and Census publications. Where indicators are computed, we show the formula or source table so the number can be reproduced. Topics are revised when a new USDA Food Access Research Atlas release or Census ACS 5-Year Estimate supersedes the prior one.
Source: USDA Economic Research Service Food Access Research Atlas. Source: U.S. Census Bureau American Community Survey (ACS) 5-Year Estimates.
What Are Food Deserts?
USDA definitions, urban vs. rural thresholds, and why distance alone does not tell the whole story.
Understanding Food Access Data
How USDA and Census datasets fit together, what the indicators measure, and common misreadings to avoid.
Food Security by County
Geographic patterns of food insecurity across the U.S. — where problems cluster and why.
SNAP Benefits Explained
Who qualifies, how benefits are calculated, and how participation rates vary across counties.
Transportation Barriers
Why no-vehicle households turn a 1-mile distance into a genuine food access gap.
How Food Deserts Affect Health
Research connecting limited supermarket access to diet quality, diabetes risk, and chronic disease.
States Leading in Food Access Programs
State-level SNAP participation, WIC, farmers market, and corner-store programs with measurable impact.
Food Access and Health Outcomes
County-level correlation between low-access tracts, SNAP participation, and chronic-disease outcomes.
Rural vs Urban Food Access
Comparing the 1-mile urban and 10-mile rural thresholds, and what each really captures.