King County Administration Building, County hall in Pioneer Square, Seattle, US
The King County Administration Building is a nine-story administrative center located at 500 Fourth Avenue in downtown Seattle, positioned between Jefferson Street and James Street. The structure houses various county departments and serves as the primary hub for local governance operations.
The building was designed by the architectural firm Harmon, Pray and Detrich and completed in 1971 to address the expanding administrative needs of King County. Its opening marked a significant moment in Seattle's development of modern governance facilities.
This administrative center houses multiple departments including the Assessor's Office, Marriage Licensing, Vehicle Licensing, and the Prosecuting Attorney division.
The building is open Monday through Friday from 8:30 AM to 4:30 PM for public services and county business. Parking is available in surrounding garages if you are driving, and public transportation stops are nearby for convenient access.
The exterior features a hexagonal honeycomb pattern across its walls and windows that creates a distinctive visual element in downtown Seattle. This geometric design makes the building instantly recognizable from different vantage points throughout the city.
Location: Seattle
Inception: 1971
GPS coordinates: 47.60310,-122.32900
Latest update: December 14, 2025 09:41
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