Washington state master contract sales (245k records / $25.4B): which vendor won, for which customer, quarterly + annual amounts, and diversity flags. Filter by vendor, customer, year, amount, diversity; aggregate who's getting WA's money.
Washington health-care provider credentials (2.45M, WA Dept of Health): nurses, physicians & surgeons, physician assistants, pharmacists, counselors, EMTs. Verify active licenses, screen for regulatory action (actionTaken / revoked), or analyze the workforce. Defaults to ~556k active.
Washington K-12 public-school enrollment (243k records, WA OSPI Report Card, 12 school years 2014-15 to current): headcounts and demographics by school, district, county and grade. Track a district's enrollment trend year over year, or compare districts statewide.
Seattle, WA building permits (public open data, 193k records): the city's construction-permit register - estimated project cost, housing units added/removed + housing-category labels, permit class, and plan-review cycle depth. Filter by type/status/category/cost or aggregate.