A new Johns Hopkins report has put Metro Atlanta near the top of a list no city wants to lead: the country's most sprawling large metropolitan areas. Researchers say the region's spread-out growth pattern is already hitting residents where it hurts, in both the wallet and the hospital. Long drives, multiple cars per household and limited options for walking or riding transit all add up to eye-popping transportation costs, higher rates of hospitalizations for heart and lung conditions, and a larger share of deadly crashes than in more compact metro areas.
How the researchers measured sprawl
The report, "Who Sprawls the Most? Mapping Urban Sprawl and Assessing its Impact on Everyday Life," uses a 21-factor compactness-sprawl index for 233 metropolitan areas and 995 urban counties, based on 2020 data, according to the Johns Hopkins Bloomberg School of Public Health. Among large metros, the analysis ranks San Francisco and New York as the most compact, while Riverside, California, and Atlanta land at the bottom of the list. The authors report that a 10% increase in an area's compactness score corresponds to roughly a 7.6% reduction in vehicle fatalities and an 18.4% reduction in pedestrian fatalities, and that increases in compactness tend to reduce combined housing, transportation and energy burdens.
Costs: cars, not mortgages
Lead researcher Dr. Shima Hamidi told reporters that families chasing cheaper housing farther from the core often discover that the real budget-buster is not the mortgage but the drive. "We found households that spent 30–35% of their income on transportation," Hamidi said, and the study highlights cases where transportation expenses actually exceed mortgage or rent payments. Hamidi told WSB Radio that multi-car households and long commutes are the main forces behind those burdens.
Higher crash risk and sicker neighborhoods
The safety numbers are grim. Hamidi told WSB Radio that people living in sprawling areas face "2.2 times higher risk of being in a fatal crash" and that pedestrians have "6.5 times higher risk" of being killed. The report also links sprawling development patterns to higher hospitalization rates for heart attacks and chronic obstructive pulmonary disease, connections that researchers say stem from less walking and weaker access to preventive care. Local planners point to missing sidewalks, high-speed arterials and a lack of transit as built-environment problems that make those risks worse.
What planners recommend
The authors outline policy directions for turning the numbers around: denser, mixed-use development, stronger urban centers and more connected streets and transit. They also provide tract-level scores and maps that local officials can use to target changes. Pockets of growth in places like Midtown and some suburban centers suggest Atlanta is slowly becoming more polycentric, giving leaders a chance to aim investments where they might move the needle. The report's data and interactive maps are available on the project's website for officials, advocates and residents to explore at Sprawl Index.
