Roughly 19 million Americans live in food deserts, and the number could be as high as 54 million depending on which distance threshold you use. The wide range comes down to how “food desert” is defined, specifically how far someone has to live from a grocery store before their access counts as limited. Understanding these definitions is key to making sense of the numbers.
Why the Estimates Vary So Much
The USDA tracks food access using its Food Access Research Atlas, which maps every census tract in the country by income level and proximity to the nearest supermarket or large grocery store. But the agency doesn’t use a single definition. It applies several distance cutoffs, and each one produces a very different population count.
The strictest and most commonly cited measure defines a food desert as a low-income census tract where a significant number of residents (at least 500 people or 33 percent of the tract’s population) live more than 1 mile from a supermarket in urban areas, or more than 10 miles in rural areas. By that standard, 18.8 million people, or 6.1 percent of the U.S. population, live in food deserts.
A broader measure shrinks the urban distance to just half a mile. Under that definition, the number jumps to 53.6 million people, or 17.4 percent of the population. That’s a massive difference driven by a relatively small change in distance, which reflects how many Americans live in that gray zone: close enough to technically reach a grocery store, but far enough that getting there without a car is a real barrier.
A third measure keeps the 1-mile urban threshold but extends the rural cutoff to 20 miles, capturing only the most isolated rural communities. That brings the count to 17.1 million, or 5.6 percent.
What Makes a Neighborhood a Food Desert
Distance alone doesn’t qualify a neighborhood. The USDA only flags census tracts that are both low-income and low-access. A wealthy suburb where residents drive 2 miles to Whole Foods doesn’t count. The tract has to meet poverty thresholds first, then the distance requirement kicks in. This two-part filter is why food deserts are fundamentally a story about poverty intersecting with geography.
The stores that count in these measurements are supermarkets, supercenters, and large grocery stores. Corner stores, gas stations, and dollar stores that sell some packaged food don’t qualify, even if they’re on every block. That distinction matters because many food desert neighborhoods aren’t devoid of places to buy food. They’re devoid of places to buy fresh produce, whole grains, and lean protein at reasonable prices.
Urban Food Deserts vs. Rural Ones
Food deserts exist in both cities and rural areas, but they look very different. In urban neighborhoods, the problem is often density without access: blocks of apartment buildings surrounded by fast food restaurants and convenience stores, but no full-service grocery store within walking distance. For someone without a car, half a mile with grocery bags is a meaningful barrier, especially in extreme weather, with young children, or with limited mobility.
In rural areas, the distances are staggering. The USDA sets the rural threshold at 10 or 20 miles, meaning some residents face a round trip of 40 miles just to buy groceries. When the nearest supermarket is that far, people rely on whatever is available locally, which often means gas station food, dollar stores, or frozen and canned options from small general stores. The sheer number of affected people is larger in cities simply because more Americans live in urban areas, but the severity of isolation is often worse in rural communities.
Who Is Most Affected
Food deserts don’t affect all communities equally. Research published in Public Health Nutrition analyzed food environments across census tracts and found that neighborhoods with higher proportions of white residents tended to have healthier food environments, measured by the ratio of healthy food retailers to unhealthy ones. Neighborhoods with larger Asian American populations showed the opposite pattern, with lower access to healthy food options.
The disparities also shift depending on geography. In metropolitan areas, Black neighborhoods did not show a statistically significant disadvantage in food access overall, but in non-metro (rural) areas, a higher proportion of Black residents in a census tract was significantly associated with unhealthier food environments. Hispanic communities in metro areas actually had slightly better food access on average, but that advantage disappeared in rural settings. Communities with greater linguistic diversity and higher concentrations of minority residents also tended to score worse on food environment measures tied to the CDC’s Social Vulnerability Index.
How Limited Access Shapes Diet and Health
Living far from a grocery store changes what people eat in ways that compound over time. Research on adolescents found that living closer to fast food restaurants was associated with higher consumption of high-fat foods, while living farther from convenience stores (which primarily stock processed snacks and sugary drinks) was actually linked to better fruit and vegetable intake. In other words, it’s not just the absence of grocery stores that matters. The presence of unhealthy options fills the gap.
The health consequences are well documented. Greater access to supermarkets is associated with lower rates of overweight and obesity, better fruit and vegetable consumption, and higher overall diet quality. These effects are especially pronounced among low-income households, Black communities, and pregnant women. Children living in poverty are particularly sensitive to the price of fresh produce: when fruits and vegetables cost less, BMI drops measurably among elementary school students from disadvantaged backgrounds.
For people managing chronic conditions like diabetes, food deserts create a compounding problem. Following dietary recommendations becomes dramatically harder when the nearest source of fresh food requires a long trip, and the closest options are fried or processed. Increased access to convenience stores, rather than supermarkets, is independently associated with higher obesity risk, meaning that simply having “a store nearby” doesn’t solve the problem if that store stocks chips and soda instead of apples and chicken.
The Number That Matters Most
If someone asks for a single figure, 19 million is the most defensible answer. That’s the USDA’s estimate using its standard 1-mile urban and 10-mile rural thresholds. But the 54 million figure using the half-mile cutoff arguably better captures the lived experience of people in cities who technically have a supermarket a mile away but can’t easily get there. Both numbers describe real barriers. The difference is whether you’re measuring severe food access problems or moderate ones, and both have measurable effects on what people eat and how healthy they are.