In the 50 states, there are 99 state legislative chambers altogether, and 87 of the 99 chambers held state legislative elections on November 4, 2014.
The Republican and Democratic parties each sought, in November, to move partisan control of the various state legislative chambers into their column. Heading into the election, Republicans technically controlled 57 chambers while the Democratic Party technically controlled 41 chambers, with Nebraska being non-partisan. However, the Republican Party was part of a ruling coalition in two additional state senates (New York and the State of Washington), giving it the partisan edge in 59 chambers, with the Democratic Party having partisan control in 39.
http://ballotpedia.org/State_legislative_elections,_2014
39/59=66%.