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Even within the Counties with the murders, the murders are heavily concentrated within areas of the larger cities within the counties. Cities for the most part with strict gun control, run by Democrats and with heavy minority populations.
Here is a color map from the 2010 census which gives the US ethnic population area break down. It's very telling. My own home state of Louisiana is also considered a high homicide state, but most of those murders are heavily concentrated in the St. Roch neighborhood, Elysian Fields Avenue between Brother Martin High School and I-610 and along Old Gentilly Rd, all in New Orleans.
With an estimated 350 million guns in the United States, we don't have a gun control problem. What we have is a culture, a moral and a democrat politician problem.