I have a feeling you're including suicide in "gun violence" here which doesn't really make sense (suicide isn't violence regardless of your feelings about guns generally). I would also expect suicide by gun to be disproportionately higher in rural areas but I can't exactly articulate why I think that.

Most non-suicide gun violence is gang related and you're going to have a tough time convincing anyone there's more gang activity in rural Nebraska than there is in inner city Chicago.