Here you go:
a link to the National Archives list of the latest voter registration stats from every state.
And here is historical data from
the Election Assistance Commission on voter turnout of previous elections.
Fairvote.org said:
In all national elections, turnout in the United States has a history of rising and falling over time, although it has never risen to levels of turnout in most of the well-established democracies in other nations. After rising sharply from 1948 to 1960, turnout declined in nearly every election until dropping to barely half of eligible voters in 1988. Since 1988, it has fluctuated, from a low of 52.6 percent of eligible voters (and 49.1 percent of voting age population) in 1996 to a high of 61 percent of eligible voters in 2004, the highest level since 1968.
Turnout in midterm elections is far lower, peaking at 48.7 percent in 1966 and falling as low as 39 percent in 1978, 1986 and 1998.
Even at its highest level in 1960, the percent of eligible Americans who turned out to vote never surpassed 65 percent. This is still substantially lower than in almost all established democracies; turnout is 70-75 percent in Canada and well over 80 percent in most other democracies, including 86.8 percent in the first round of the French presidential election and 91.7 percent in the 2004 proportional representation election for Luxembourg’s legislature.
