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The most Republican and Democratic counties in America

24/7 Wall St. logo 24/7 Wall St. 6/25/2015 Alexander Kent, Thomas C. Frohlich and Mark Lieberman

With the 2016 presidential primaries less than 12 months away, campaign season is well under way for candidates of both parties. In the last election, President Barack Obama won with about 51% of the popular vote, winning 26 states and the District of Columbia to capture 332 of 538 electoral votes. Despite the Democratic victory, an analysis of the reddest and bluest counties in each state shows stark differences between them.

Based on voting data compiled by political news organization Politico and a review of current and historical representation in the U.S. Congress, 24/7 Wall St. created an index to measure the political leanings of county residents. Shannon County is not just the bluest county in South Dakota, but also the most Democratic county in the nation. Madison County, Idaho, on the other hand, is the reddest county in the state and the country.

In general, people living in the bluest counties tended to be worse-off financially compared with Republican-leaning areas. The bluest counties of 31 states had a lower annual median household income than the comparable national income of $53,046. By contrast, the median household income was higher than the national figure in 29 of the 50 reddest counties. In comparison, the reddest counties in 29 states had a median household income greater than the comparable national income of $53,046. By contrast, the median household income was higher than the national figure in only 18 of the 50 bluest counties.

While counties dominated by Republicans tended to be wealthier, residents in these areas also tended to have lower educational attainment rates compared with the bluest counties. In the five years through 2013, the percentage of adults who had attained at least a bachelor's degree was lower than the comparable national rate of 28.8% in 36 of the 50 reddest counties. This was the case in just 17 of the bluest counties.

Click through the slideshow below for the most Democratic counties in America. (Click here for the complete report and methodology.)

Alabama, United States, North America

Click through the slideshow below for the most Republican counties in America. (Click here for the complete report and methodology.)

Farmers arrive for a meeting of farmers and state officials to discuss the impact of the Alabama Immigration law on their livelihoods in Oneonta, Blount County, Ala.

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