Updated 10:40 p.m. CST
Ellen Troxclair will represent District 8 on the Austin City Council.
According to unofficial results, Troxclair earned 50.23 percent, or 6,229 votes, to Ed Scruggs' 49.77 percent, or 6,172 votes.
Troxclair said she is excited to get to work.
"I think it's past time that Southwest Austin has a voice at City Council," she said. "I look forward to being a taxpayer advocate and working with council members to tackle issues the city is facing."
Posted 7:10 p.m. CST
According to unofficial results, Ellen Troxclair has a narrow lead among early voters in the runoff election to represent District 8 on Austin City Council.
Troxclair has 51.71 percent of early votes, or 4,384 votes, and opponent Ed Scruggs has 48.29 percent, or 4,094 votes.
In early December Troxclair said she was feeling good about the campaign's progress in the final days of the race.
"I think it's going really great," she said. "I feel voters are continuing to be engaged and are looking to elect an advocate to City Council."
Scruggs said his campaign is following the same door-to-door, grass-roots plan it took for the November general election.
This is the first election in which Austin residents can vote for City Council candidates in 10 distinct geographic districts, rather than voting citywide for at-large City Council candidates.
Voters approved the new City Council system in November 2012. The system separates the districts for council candidates but preserves at-large voting for the Austin mayor's office. The city's Independent Citizens Redistricting Commission established the new districts in 2013.
After the new City Council is elected, five members will be selected at random to serve initial two-year terms and five will serve initial four-year terms. The initial terms allow future council elections to be held every two years, and future council terms will last four years.