All-Transactions House Price Index for King County, WA was 343.19000 Index 2000=100 in January of 2025, according to the United States Federal Reserve. Historically, All-Transactions House Price Index for King County, WA reached a record high of 343.19000 in January of 2025 and a record low of 13.99000 in January of 1975. Trading Economics provides the current actual value, an historical data chart and related indicators for All-Transactions House Price Index for King County, WA - last updated from the United States Federal Reserve on May of 2026.