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As the Supreme Court listens to arguments about the Patient Protection and Affordable Care Act, the uninsured rates across the country can be as high as 50 percent in some metro areas.

A new survey by Gallup and Healthways found in 2011 that 50.5 percent of adults in the McAllen-Edinburg-Mission, Texas, metro area had no health insurance. That's a majority.

On the other end of the scale are four metro areas in Massachusetts.

Boston-Cambridge-Quincy had 4.4 percent uninsured, Worcester had 4.7 percent uninsured, Barnstable Town 5.5 percent and 5.9 percent in Springfield, Mass.

Could it be because health insurance is required by state law?

Flipping back to looking at metro areas with high numbers of the uninsured are El Paso, Texas, with 31.8 percent uninsured; Visalia-Porterville, Calif., with 30.3 percent uninsured; and Yakima, Wash., with 29 percent.

The national average of uninsured adults is 17.1 percent, but the Gallup analysis points out there are wide variations in coverage across the country. "Whether this wide variation in uninsured rates across metro areas persists in the years ahead may depend on the fate of the U.S. health care law," Gallup's Elizabeth Mendes wrote on its website, "including the U.S. Supreme Court ruling, which is set to come in June."

The task President Barack Obama's health care system overhaul had was, as Reuters put it, "to provide health insurance to more than 30 million previously uninsured Americans."

This article contains aggregated content from Gallup and Reuters.

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