Voting Turnout Statistics
Total number of Americans eligible to vote 218,959,000
Total number of Americans registered to vote 146,311,000
Total number of Americans who voted in the 2012 Presidential election 126,144,000
Percent of Americans who voted in the 2012 Presidential election 57.5 %

Voter Registration by Demographics
Age 18 to 24 58.5%
Age 25 to 34 66.4%
.....

Bookmark this: Rock the Vote's domain = 2016 Voter Registration Deadlines

http://www.rockthevote.com/get-informed/elections/important-election-dates-deadlines/by-state.html

HUFFPOLLSTER: A State-By-State Guide To Party Registration

Looking for party registration statistics for the 31 states plus D.C. that track them in official records? We’ve got ‘em. (May 2014)

.... huge variability in percentage of voters who remain unaffiliated or unclassified, from a low of 8 percent in Kentucky to a high of 92 percent in Arkansas. One cause for that variability is the degree to which individual states limit primary voting ....

Democratic, Republican Identification Near Historical Lows

42% identify as independents, 29% as Democrats, 26% as Republicans
Independent identification at least 40% for fifth consecutive year