This post looks at the share of Americans who have no health insurance, in 2015, by US Congressional Districts. The lowest (best) congressional districts are in the State of Massachusetts. Eight Massachusetts districts rank in the top eight, ranging from a low of 1.9 percent uninsured (Massachusetts District #8, Lynch, D-Boston) to 3.2 percent uninsured (Massachusetts District #9, Keating, D-Bourne).
In ninth place is the Minnesota 6th Congressional District (Emmer, R-Delano). And in tenth place is the Illinois 18th Congressional District (LaHood, R-Dunlap).
This is all based on data from the 2015 American Community Survey, Table GCT-2701.