Just because I was interested I ran the numbers for our county:
I could not find the figures for eligible voters but based on some population calculations and age breakdowns I estimate that about 75% of the county population fit into that category. Based on this is appears that only 35% of the eligible voters bothered to vote in this Texas county.
Based on registered voters only 64% of them turned out.
Broken down further:
In a race between a Republican and a Democrat the split was 68%(R) vs 32%(D).
In a race between a Republican and a Third Party candidate it was 80% (R) vs 20%(I).
If there was a Republican/Democrat/Third Party race it was 65%(R) vs 31%D) vs 4%(I).
Which I thought was interesting that a Libertarian/Green Party/Writein voter was 3x more likely to come from the Reps than the Dems.
These numbers were pretty consistent regardless of the political position being run for.