Ballotpedia: “On November 6, 2018, elections were held for 6,073 state legislative seats across 87 of the nation’s 99 state legislative chambers. Five hundred and eight elections (8.3%) resulted in control of a seat changing to a new party. Of the 508 flips, 391 (77.0%) were Republican seats that flipped to Democrats and 93 (18.2%) were Democratic seats that flipped to Republicans.”

