One-hundred and five of the 6,073 state legislative races in 2018 were decided by fewer than 100 votes. Ninety-eight of these races were in state house races, and seven were in state senate races.

 

Fifty-four of the races resulted in a change in partisan control—36 favoring Democrats and 18 favoring Republicans. In the seats that did not change control, Republicans held 36 and Democrats held 15.

 

Seventy-eight of the races (74.3 percent) occurred in state legislative districts with populations of less than 25,000. Districts of this size make up 26.3 percent of all state legislative districts.

 

The New Hampshire House, which has the smallest legislative districts in the country, had 34 of the races—more than any other chamber. The Vermont House, which has the second smallest districts in the country, had eight races—the second most of all legislative chambers. The other 63 races were spread across 32 chambers. Twenty-two of these chambers had just one race.

 

One race in this analysis—Alaska House District 1—was critical for partisan control of state governments. Bart LeBon (R) defeated Kathryn Dodge (D) by one vote. His win caused a 20-20 split between Republican-led and Democratic-led coalitions in the Alaska House. Control was eventually split between the parties after a month-long period where neither party had control.