The measure to raise the minimum wage in SeaTac to $15 an hour now leads by just 19 votes after the latest count Wednesday afternoon.
King County Elections reported an additional 156 ballots from SeaTac were counted Wednesday.
SeaTac Proposition 1 gained 66 yes votes, for a total of 2,749.
Ninety no votes were added to the tally, giving opponents a total of 2,730 votes.
The measure is all but certain to be heading for a recount.
An estimated 250 to 350 ballots remain. The final results will be certified on Nov. 26.