Hundreds of health workers are expected to treat as many as 4,000 patients at the free, four-day Seattle/King County Clinic at KeyArena Thursday through Sunday.

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As many as 4,000 people are expected to receive free medical, dental and vision care at a giant health clinic offered Thursday through Sunday in KeyArena at the Seattle Center.

Between 750 and 1,000 health-care providers — doctors, dentists, ophthalmologists and others — are set to volunteer with more than $2.5 million in health services to people without regular care, said Deborah Daoust, director of communications for Seattle Center.

This is the second year the four-day Seattle/King County Clinic has been offered and organizers say they hope it’s even more successful than the first event, where nearly 3,400 people were treated.

“There were people having five, six, seven, eight or nine teeth pulled,” Daoust said. “There were people who had never seen a dentist in their life.”

Last year’s clinic provided about $1.24 million in dental care, $730,000 in medical care and $400,000 in vision care, according to a report about the event.

The clinic is open to anyone who needs care on a first-come, first-served basis. No identification or proof of citizenship is required.

The only qualification for care is that people be willing to wait in line for free admission tickets at the beginning of the clinic each day. Children younger than 18 must have a parent or legal guardian with them during registration and services, except in cases of homeless youth ages 13 and older who meet requirements of the Mature Minors Doctrine.

Tickets will be distributed at the Seattle Center Exhibition Hall, 301 Mercer St. The center opens at 12:30 a.m. each day. Organizers will distribute admission tickets beginning at 5 a.m., with services beginning at 6:30 a.m. Patients may park for free in the Mercer Street parking garage at Seattle Center, between Third Avenue North and Fourth Avenue North, each day of the clinic.

It may take three hours to admit all ticket holders each day.

Inside the clinic, all procedures and services are offered for free. Patients can seek care in up to two areas each day, except they may not seek both dental and vision care on the same day. They can return on other days for additional services.

Last year, health-care providers identified diabetes, breast cancer, markers of potential prostate cancer and other serious health issues during the exams.

They also offered eye exams, free prescription glasses, Pap smears, mammograms, X-rays, lab tests, influenza vaccines, foot care, acupuncture and other services.

About 40 percent of those who received care were unemployed, and 75 percent had incomes below 200 percent of the federal poverty level. More than half hadn’t seen a doctor in more than a year, the report showed.

For more information, visit or call 206-684-7200.