Mosqueda has 57% of the votes as of Thursday afternoon.
Trailing is Kenneth Wilson with 18% of the vote, followed by Kate Martin.
A total of 10 candidates faced off in the primary election for the at-large position on the council.
The top two primary candidates advance to the general election in November.
Mosqueda raised at least $176,000 in donations and Democracy vouchers, well past any of her opponents.
Mosqueda was elected to the council in 2017 as a first-time candidate. She grew up in the Pacific Northwest and is a third-generation Mexican-American, and describes herself as the "daughter of educators and social justice activists."
The incumbent said she wants to "continue the work we’ve started to promote healthy communities, lift-up working families, build more affordable housing, and create an economy that works for all."
Among Mosqueda's proposed legislation is the recently-upheld payroll tax that will tax businesses that spend $7 million or more on payroll in the city.
Mosqueda proposed the JumpStart Seattle tax in 2020 as a way to generate revenue to help the city recover from the economic impacts of the coronavirus pandemic.… Read More
💥Endorsement alert💥 Thank you King County Young Democrats for your endorsement in my race for King County Council District 8. Empowering our next generations of leaders is so important. Thank you for all of your work! ... See MoreSee Less
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Mary's Place is truly a remarkable space! Across King County, they are providing housing, support, clothes, necessities, childcare and health care! I am so thankful for their work and commitment to doing everything to support the babies, kiddos, and families who they have seen with increased needs in the last few months. Thank you Marty, Linda & the whole Mary's Place team ... See MoreSee Less
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Mary Place is amazing organization. Thank you Teresa Mosqueda and the Mary's Place leadership.