County-by-county voter registration swings, 1/2015 to 1/2016

This edition of my Voter Registration Maps series shows the county-by-county trend in voter registration since last January.

Registration swung toward the Republican Party in all 77 counties. Jefferson County had the largest swing, posting a shift to the GOP of 5.82%. The smallest change was in Tulsa County, which came in at 0.81% toward the Republicans.