Here’s % voter turnout, by party registration, as of end of March 5, 2016 (early in-person & absentee), for the top 10 and bottom 10 performing counties:

County % Rep Turnout County % Dem Turnout
LEE 23.3 PIN 19.54
PIN 21.0 LEE 15.98
BAK 17.7 MON 15.24
SUM 17.4 SUM 14.41
CIT 16.3 SAR 13.75
CLL 16.0 HER 13.59
MON 15.8 MRT 13.09
DAD 15.4 CHA 12.82
MRT 15.4 CIT 12.52
TAY 14.8 MAN 11.46
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HOL 6.8 WAK 4.85
CLM 6.7 PAL 4.46
GUL 6.6 LAF 4.18
BAY 6.5 HOL 3.94
LAF 6.5 LIB 3.91
MAD 6.3 GUL 3.9
PAL 5.1 UNI 3.09
UNI 4.8 MAD 2.94
GLA 2.7 HAR 1.17
HAR 2.0 GLA 0.91