The number of registered voters in the United States, in the 30 states (plus D.C.) that have registration by party, declined by 1,516,272 between November 2012 and March 2014. Nevertheless, during this period Libertarian registration in those states increased 11.4%. The registration total for all other nationally-organized parties declined during that period. The number of voters who are independent or who are registered in miscellaneous parties increased .7% during that period.
The April 1, 2014 printed Ballot Access News will include a chart showing the number of voters in each party, and the number registered as independents or in miscellaneous designations, by state. All of the data is from January, February, or March 2014, except that data from New York, Connecticut, and Pennsylvania is not available for 2014, so it is from 2013.