On Nov. 2, 2021, control of at least nine state legislative seats flipped from one political party to another. Eight of those seats flipped from Democratic to Republican control and the other flipped from Republican to Democratic control. There are 14 outstanding races still to be called, so these numbers could still change.
The nine seats flipped out of the 220 seats up for election means that 4.1% of the state legislative seats up for election on Nov. 2 changed party control. The net change was +7 for Republicans and -7 for Democrats. In 2019, 33 of 538 seats (6%) changed party hands. The net change that year was +6 for Republicans, -2 for Democrats, and -4 for Independent or third parties.
More state legislative seats flipped this year as a result of special elections, which are not included as part of this analysis. Five seats have changed party hands as a result of special elections in 2021: three from Democratic to Republican and two from Republican to Democratic. Two flips (one each way) happened as a result of a Nov. 2 special election.