Ballotpedia is tracking state legislative races without a known Democratic or Republican candidate in the 2020 elections. As of April 29, 764 state legislative races do not have a Democratic candidate, and 583 do not have a Republican candidate.

The most seats without a candidate from one of the major parties are concentrated in three states: New York, Oklahoma, and Georgia. New York has the highest number; of its 213 state legislative seats, 74 races (34.7%) do not have a Republican candidate. Oklahoma and Georgia are tied with the second-highest at 68 races. Of the 125 seats on the ballot this year in Oklahoma, 68 races (54.4%) do not have a Democratic candidate. Of the 236 state legislative races that are on the ballot in Georgia, 68 races (28.8%) do not have a Republican candidate.

In 2018, 6,073 state legislative races were on the ballot and 2,017 (33.2%) did not feature major party competition. In comparison, there were 2,477 such races in 2016 and 2,606 in 2014.

During the 2020 election cycle, the filing deadline to run for the state legislature has passed in 30 states. Washington has the next filing deadline on May 15.