Thirty (0.5%) of the 5,875 state legislative races in 2020 were decided by fewer than 100 votes. Twenty-nine of the 30 races were in state houses, and one was in a state senate.

Partisan control changed in 15 (50%) of the 30 races. Thirteen of the partisan changes (43.3% of the 30 races) were Republican pickups, and two (6.67%) were Democratic pickups. Fifteen seats did not change partisan control.

Of the 86 state legislative chambers that held elections in 2020, 14 (16.3%) had at least one race that was decided by fewer than 100 votes.

The narrowest margin in any state legislative election last November was for a seat in the New Hampshire House of Representatives. Incumbent Timothy Fontneau (D) defeated Harrison deBree (R) by a margin of four votes.

The New Hampshire House of Representatives had 11 races decided by fewer than 100 votes—more than any other chamber. As of 2010, there were, on average, 3,291 people in each New Hampshire House district, making them the smallest state legislative districts in the country.

The Vermont House of Representatives had five races decided by fewer than 100 votes—the second-highest number after the New Hampshire House. As of 2010, there were, on average, 4,172 people in each Vermont House district, making them the second-smallest state legislative districts in the country.

Most of the races took place in districts with small population sizes compared to the rest of the country. Twenty-four races (80%) were in districts with a population of less than 25,000. Districts that size made up 26.3 percent of all state legislative districts as of 2010.