Image courtesy of Virginia Commonwealth University Center on Society and Health and the Robert Wood Johnson Foundation.

Your Metro stop doesn’t just indicate which other languages you’ll mostly likely hear at the station. A new map shows a life expectancy difference of up to eight years along different parts of the regional track.

While Arlington and Fairfax counties in Virginia have an average life expectancy of 86 years, Montgomery County residents are looking at an average of 84 years, and D.C. and Prince George’s County folks live to be an average of 78 years.

The national average is 79 years.

The map, from the Virginia Commonwealth University Center on Society and Health and the Robert Wood Johnson Foundation, seeks to show how “health differences” can vary across even tiny geographical distances. The idea is that health amounts to more than medicine—and a person’s well-being is influenced by factors beyond a doctor’s care, including employment options, places for safe physical activity, stress levels, affordable housing, and more.

In Fairfax and Arlington, for instance, there are higher rates of high school graduation, and lower rates of unemployment, children in poverty, and bad housing situations than in Prince George’s and D.C., per the RWJF’s county rankings.

Image courtesy of Virginia Commonwealth University Center on Society and Health and the Robert Wood Johnson Foundation.

But even within these seemingly well-off counties, disparities persist. A previous report from VCU’s Center on Society and Health further broke down life expectancy in Northern Virginia by neighborhood—showing that even Fairfaxers are far from guaranteed those sweet 84 years.

While residents of Fairfax County’s Western Lorton live an average of 89 years, their Eastern Lorton neighbors live to be 79, on average. Why the 10 year difference? The report says “geographic disparities in socioeconomic status and often reflect the presence of minorities with poorer access to economic and health care opportunities.”

Recent studies of D.C. health have found that black men in the District have a life expectancy of 68 years, while white men live on average to be 83, and there’s also a nine year gap between white and black women in the city.