Dalia Palchik, a teacher who graduated from Thomas Jefferson High School, defeated Republican Patty Reed by a 58-41 percent margin with 100 percent of precincts reporting.
Reed, who has represented the Providence District on the Fairfax County School Board that includes portions of Falls Church since 2009, earlier this year voted against a measure that added LGBT-specific information to the Family Life Education curriculum for middle and high school students.
The Republican abstained from a vote on a proposal that added gender identity to Fairfax County School District’s anti-discrimination policy. Reed supported the inclusion of sexual orientation in the regulation that ultimately passed.
The Traditional Values Coalition endorsed Reed along with Elizabeth Schultz, a Republican who also voted against the measures.
Schultz ran unopposed.
Ryan McElveen, the Democrat who spearheaded the anti-trans discrimination proposal, won re-election on Tuesday.