This is cool, via wonkblog:
The availability of basic health care varies radically from place to place across the nation.
To the left of the vertical slider bar, counties outlined in orange had no doctor's office in 2009, according to the Census Bureau. Clark County, Mississippi, for example, had a population of over 17,000 but no doctor's office, while Manhattan had a doctor's office for every 500 residents.
The map to the right shows the relative availability of primary health care providers by county. Enhanced access to health care is key to improving the health of Americans.
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In health care, as in everything else, it's location, location, location.